Five copies of Ethan's Cyndaquil in Build and Battle game mode.

n00bl00d

My opponent had 2 Quilava and 3 Cyndaquil.
I think that should not be allowed.

Justerfrog5557

Build and battle doesn't have the 4 copies rule. This is intentional to match the physical format.

n00bl00d

https://community.pokemon.com/en-us/discussion/comment/159525#Comment_159525

Yes, thank you for clearing that up. I looked at the announcement and see that having more than four copies is allowed with Radiant Pokémon and Ace Specs as exceptions.