I am the enemy, I will succeed
I hate nerfs because instead of making more characters viable, it just stops characters from being viable. Unless a character is OP there shouldn't be any nerfs, and in this case both Olimar and Inkling require a lot of skill to learn, and at their best are just powerful, not overpowered. So that brings me back to first thing I said:
Learn the match-up, practise against them in arenas and offline, but don't call for nerfs just because you can't beat the character.
If anything I'd like to see some buffs to characters who are bad such as Little Mac and King K. Rool.