So i decided to play pokemon fire red because i love old gen. So i caught a MODEST magicarp. so his special attack stat should be increased and his attack should be his lowest stat. but when magicarp finally evolved it was the other way around. his attack is its highest stat and his special is its lowest.
are the natures different? I feel i wasted so much time on that magicarp now i want to release it
You're misunderstanding the effect of the various personalities. Modest means that there's a small bonus given to Sp. Attack whenever stats are calculated, and a small penalty to Attack. Gyarados has a base stat in Attack of 125, and a base stat in Special Attack of 60. Even with a Modest nature, Special Attack is not going to be higher than Attack.