I play unlimited, and i play tepig on the bench i retreated my pokemon and took out tepig to use wallys training i couldnt evole the pokemon cause it counts as evolving but does the supporter get discarded ?
To add, this really only applies if you are searching the deck or doing something to look at/discard from your opponent's hand.
That's because you don't know what cards are in those areas. Field and discard are public knowledge, so you couldn't play Potion if you had no damage anywhere to remove, or Energy Retrieval if you had no basic energy in your discard.