If you're talking about catching Mewtwo in those games, here's what to do after:
Enjoy your powerful Pokemon! Mewtwo is a legendary Pokemon with incredible stats and moves. You can use it to:
* Train it further: Level it up, teach it powerful moves, and evolve its stats with EVs and IVs.
* Use it in battles: Challenge other trainers, gym leaders, or even the Elite Four with your powerful new ally.
* Trade it: Trade Mewtwo to other players to complete their Pokedex or strengthen their teams.
* Show it off: Show off your achievement to your friends and other players.
Remember: Mewtwo is a rare and powerful Pokemon. Make sure to train it well and use it wisely!