You win if you take your last prize card. You lose if you don't have an Active Pokémon. You lose if you can't draw a card at the start of your turn. If multiple conditions occur at once (i.e. the first two), then the person who "wins most" wins (or it's a draw). That's it.
I've not played the TCG2 game, just the first one (and not very much). I don't intend to add any gimmick features in anyway.