In my nuzlocke rules for sword and violet I go to a den (dyna den or tera den) to keep that surprise factor and catch the pokemon.
Due the missmatch of types in tera dens I think as my pokemon having the soul of the teratype and that is what affect their designs

from the pervious one, joe and drake are just their regular designs with joe higashi and francis drake as inspirations
tynamo is steel tera so the lil fish is made out of electric panels
pichu is ground and its name is insulator, it keeps its tail shoved in the floor to ground itself
bonsli the flying tera is trebuchet because yeeting rocks making the fly, its pseudo leaves are a pair of wings and the basket to shoot
Yorei is a toxel ghost tera so it walks in the ghostly way and it has the soul thingy instead of the electric one on the forehead
The team has too many low stats babies and tynamo so I give all the random things that boosts stats to pichu and walk along him as well as do picnics to raise its friendship
Insulator evolves into pikachu still shoving its tail in the ground to ground itself

Time to face Katy