Diaper/babyfur art...? Like a diapered or baby Pichu?

You could always just make some cooler looking art of whatever character, pulling off different poses I guess! Legendary Pokémon about to go head to head or some smaller Pokémon sleeping in a forest.

If still on the fetish side, Pokémon or Digimon showing off their feet or something like that could work, I suppose!

And if you wanna go off the wall, make some sort of fusions! Fuse Digimon with other Digimon or Pokémon, or vise/versa. Draw what the outcome would be!

For examples of characters to use, you could have:
Groudon and Kyogre, Starly
WarGreymon, Agumon, Golem
Charmander and Bulbasaur, Agumon and Gabumon