Gym attackers get first mover advantage; they get to choose the match-ups. But, what if I defend with a pokemon that most have never seen before, and I change it's name? Then, the attacker can't identify it (without visually searching which is a lot of effort), and so they won't know the type, and attack moves, of what they are fighting. Thus, the attacker can't get the best match-ups. imho: allowing attackers to choose the match-ups makes gym defense impossible.
Is there a flaw in that strategy?