A wall of text, here we go!

So, here's my random lil tips/guide thing for Cybersleuth, I got confused at first on how to get some of the digimons due to stat requirements being way too high, sooo... here's some tips, going through every aspect I can think of when it comes to levels and stats and evolving. A bunch of these are more applicable towards the end game (no spoilers here tho), but eh, here we go:

- EXP and leveling up: When possible, get yourself a PlatinumSukamon, maybe even two or three. They suck at fighting, but they have an ability to double your EXP (they have to be in the battlefield when the battle ends). Grinding around the endgame with 3 PlatinumSukamons nets you about 10 000 - 30 000 EXP per battle and makes it really fast to reach level 99. Doing fights with just Sukamons sucks ass, but if you have a quest digimon/character following you around, they often help alot. Equip some status bullshit skills (dot, char reversal, sleep, stun, poison) and just shoot those around as any other digimons deal the damage.

- Evolving and degenerating: While doing this raised your Digi's stats like crazy in the DS games, that doesn't work here. For example, a Greymon always has the same base stats on each level - you can see the stats in the field guide thing you can access from the pause menu. You can get a boost from items, digi's nature (fighter, brainy, etc), and from farm training. Evolving and degenerating is mainly worth it to raise the max level and ABI, and to learn different moves from different digis/forms, it's good to have a bunch of status moves and strong attacking moves on hand.

- Skills: For most elements, there's a physical attack, magic attack, and a large-area attack that hits everyone on the opposite team. Each damaging skill has three levels, I, II, and III (obvious enough), with damage almost doubling on each level. Status skills have just a single level, they are always weak, but deal the status on target - Dot, Sleep, and Char reversal are especially useful. Healing moves have different levels/ranks, but aren't ranked by numbers. All digimons have their signature move, some have two, keep this in mind.

- Level: If the required level is for example 26, but your digimon's max level is 25, just evolve to another form, and/or degenerate. By evolving and degenerating your digimon's max level goes up, higher stage evolutions/degenerations increase the value much more at once. Lower stage digis always have lower max level than higher ones, but by doin the back and forth evolving let's even your rookie digis reach 99. Max level is 99

- ABI: This value goes up the same way as max level does. ABI limits how much training a digimon can get - this means bonus stats, and these will be veeeery important to utilize when going for more difficult evolutions with higher requirements (such as getting Tokomon to evolve to that one mystery digimon, not gonna spoil it). Max ABI is 100

- CAM: Friendship. This will be going down when farm training, not much you can do about that, and raising CAM back up can be difficult. CAM slowly goes up when you keep digis in your party trio, another way to bring it up is feeding your digi some food at the farm - buying better (EXPENSIVE) meats can really help here, just don't bother with Exciting meat unless you wanna keep saving and loading not to lose money. Keep your Friendship and Friendship DX items until you need them for reaching CAM% needed for evolving.

- Reaching any other stat goals for evolutions: Farm training and setting the right nature! Let's say your digimon has 50 ATK at level 1, and needs to reach 200 to evolve. By reaching from level 1 to level 99 his ATK will probably go up by 99 points, to 149, and that won't be enough, and equipping boosts doesn't count with evolving. The solution is setting the right nature, and doing some farm training.

Before doing any training though, check your digimons ABI value. 100 ABI = 100 extra points your digimon can get from training. HP is *10. There's some weird shenanigans with this tho, pretty sure I once had a digimon with 33 ABI, but he had +33 on two different stats, but uh... yeah, anyway! Now check your digimons stats. If you see those +1 or +40 or whatever values next to the actual stats (unequip any boosts first), those are the training/bonus stats your digimon has so far. If they are too high (compared to ABI), you need to use the stat restraint items to reduce them down to make room to train other stats. Let's say our digimon's ABI is 100 here, and his defence already has +100, you can't get any stats into the ATK from training. Use DEF restraint whatever items to reduce the DEF back down (you can buy the restraint items in the EDEN shop), and bam, your digimon can train and asign the bonus points again.

Now put your digimon into one of the farm islands and train him with right digimon as the farm's leader, using the Train command. The farm leader's nature is very important here, Fighter, Brainy, all those different natures make your farm train in specific stats. If you want ATK, set a Fighter-type digimon as your farm's leader. If you don't have one, just use the "Fighter Patch" item to change one of your digimons nature to Fighter. If ATK is your highest stat to get and the biggest obstacle, it might be worth it to do this on your digimon-in-training, since natures give a slight boost in stats too (Fighter gives a boost in ATK).

Now, let's say your digimon got +100 bonus to his ATK before you noticed, but now you notice he needs to train in SPD, too. Well, either change his nature to Nimble (SPD) or use another digimon with Nimble to train the farm in SPD, but wait, you can't gain any more bonus stats, right? Like before, just use the stat restraint items to bring the ATK down some, and bam, you can asign some points to his SPD now.

EDIT/NOTE: I only now figured out how the ABI thing properly works, but since I'm not gonna rewrite everything, I'll just add it here: You can ALWAYS get 50 stats from training, even if ABI is 0. Then, you can get more depending on your ABI, divided by two. So, if your ABI is 100, that gives 50 extra points to use (so, 100 in total). ALSO, when training, your digi gets stats depending on the leader's nature, aswell as his own nature. If the leader is Fighter, but the digi training is Defender, he gets stats in both ATK and DEF. Also, when training, your digimon appearently needs to have enough CAM/friendship if you're doing intensive training (level 2 or 3), but I haven't tested this myself yet. Gonna trust this info tho :P

To make training faster, you can feed your digimon some of those fancy foods those mention how they raise your digi's stats. They really just raise the training-stats, not their actual stats.

TL;DR - Soo... in nutshell, to reach a specific digimon in the evolution tree.
- Casually evolve and degenerate your digimon without worrying too much to raise max level and ABI to the required point (and to pick up and learn some good skills!)
- When going for your goal: Check stats and think ahead - in general they go up by about 99 points from level 1 to level 99, so, if they start at ATK 50, their final ATK will probably be 150 without any farm training
- If you can't reach a required stat through leveling (due to being impossible or just too slow), farm train
- To farm train, first look at your digi's ABI, then bonus stats (the +5, +65 etc things), reduce any unneeded bonus stats with stat restraint items, and then farm train the needed ones under right-natured farm leader
- Finally, bring your digi's CAM% back up by either doing some battles or by feeding your digi some meat

Nature (I just now noticed I've been writing "nature"... but yeah, I mean the personality) guide for farm training - again, make sure your farm's leader has the desired nature for whatever stat you need:
HP - Durable
SP - Lively
ATK - Fighter
DEF - Defender
INT - Brainy
SPD - Nimble

There's Builder and Searcher too, but those don't really do anything when it comes to stats grinding... well, atleast won't make the training get concentrated so heavily. I'm not fully sure how these affect training tho.

Oh, and since I mentioned a few status things a couple of times I'll explain those too:
- Dot - Can only use Attack. Very effective on digis who rely on magic attacks and high INT
- Character reversal / Bug - Reverses the data/vaccine/virus thing. If your opponent's attack deals 2-3x super effective damage, you can just cripple that to being not very effective by using character reversal. This status seems to work on bosses, too, used it on a few towards the endgame. Useless on Free-attribute digimons, tho.
- Sleep - Kinda like in pokemon, an amazing way to make your opponent unable to do a thing for a few turns, they won't wake up from attacking either!

A good alternative for Char reversal/Dot is confuse, however confuse heals up on it's own. Now that I think about it, confuse might be the better choice actually since it completely skips the turn, I've just been using Dot myself soooo... yeah, hah.