If you apply Pokey's third ability as a replacement effect to rolling a d20, other than the original effect that called for the d20 roll, all other game effects, including replacement effects and triggered abilities, recognize that you flipped a coin rather than rolled a d20
When you need to have an answer to anything thrown at you, the best way is to draw a lot of cards before then
Weakness: Grass (x2) Resistance: None Retreat: 1 #97 Shiftry Darkness HP150 Stage 2 Evolves from Nuzleaf [D] Tengoodbye: If your opponents Active Pokemon has any damage counters on it, return that Pokemon and all cards attached to it to your opponents hand
However, after a feeling that some sets were so flooded with serialized cards that they werent as special anymore, WotC changed tactics and moved to one featured card instead
Main Phase, where the turn player can play the cards from their hands, activate effects, summon monsters