And, once its your turn again, you should be able to evolve that Pokmon to its Stage 2 from your hand, as it was already in play at the start of your turn (source: Pokmon Rulings Compendium)
EDHREC, CEDH Decklit Database and countless YouTube Videos come to mind
Similarly, had I on turn 1 attached a water energy to my benched Staryu instead of my active Goldeen, I would have been prevented from progressing when I ended the turn instead of when I attached the energy card
Illustrated by Julia Metzger Standard Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
20 each of these three SwSh stamped Holofoil cards
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) Whenever a nontoken creature you control dies, if it had counters on it, create X tapped 2/1 white and black Inkling creature tokens with flying, where X is the number of counters it had on it