note that both of them are from Japan and while I'm not saying Pokemon copied fairy tails the concept and idea of fairies or "light" as pure incorruptible force is quite popular in Japan and Pokemon took that idea and applied it in their world
Both Japanese =/= Same Thing
Yes, because Xerneas, Whimsicott and Slurpuff are magical girls. Magical, yes. But magical girls? Definetley not sailor girls or witch hunters.