imagine being a young child playing through sinnoh for the first time. you are traveling through mt. coronet and decide to go fishing to look for a gyarados. you stumble upon some ugly looking fish. catch it and put it in your team as a joke. it turns out it's actually quite good, and soon evolves into a Milotic. all of your friends are jealous because they've never even seen the fish and think you're lying about where you caught it.