https://pokemondb.net/pokedex/national
Put the sprites from this list in place of team builder sprites and in place of disable animations sprites, or place them in place of team builder and have a choice option for disable animations like :
Disable animations
Use BW sprites instead of XY models
Use modern sprites for past generations
Put the sprites from this list in place of team builder sprites and in place of disable animations sprites, or place them in place of team builder and have a choice option for disable animations like :
Disable animations
Use BW sprites instead of XY models
Use modern sprites for past generations