Pokémon: I Traveled Through Time and Became a Croaking Frog

[System + Time Travel + Misfortune of the Protagonist + Targeting the World] I like to put happiness on top of other people's pain. The author's writing is bad + a little sloppy + novices, please forgive me. Ye Chen: "Fighting type and poison type elves? Eat my magic power." Ye Chen: "Water Turtle? Eat a thunder palm from me, and eat a straw knot" Ye Chen: "Is the grass type very useful to me? Switch the form, Explosive Flame Ninja Frog, and take my move, Fire Shuriken." Ye Chen: "Oh! I have learned too many skills, and they are not very good. Arceus uses slates, and sometimes I don't even react. How lonely it is to be invincible!" (This is the first time the author writes, and he is also a scumbag in writing. If there are any bad points, everyone can point them out and make progress together. This is to describe the protagonist in the later stage. The development period is a bit long, so don't criticize if you don't like it.)