i think a water stone but im not intirely sure! you also probably want to know were you catch one but i don't know what game you have or if you even have a game! Gyarados does not evolve i dont know why you think that
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It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.
It will evolve by level. Teddiursa will evolve into a Ursaring at level 30.
They evolve at level 36
It will evolve at level 36.
it evolve on level on 64