Choosing only ONE, which Pokémon would you have as your sidekick and why?

Charizard: That's my partner right there. I've wanted one since I was seven and my love for it has continued to grow over the years. I've given many descriptions on my life with a Charizard in the past, but the best summary is we would be inseparable and do everything together. I can't think of any other Pokémon I'd want to live with more than I do this one.

However, you say "sidekick" which makes me think I'm a super hero or something, and while Charizard is good as a hero sidekick, it's not what I would go with

Ceruledge: This guy recently passed Charizard as my favorite Pokémon, but Charizard is still my partner. However, as a sidekick, I want Ceruledge. She will put all sense of morals to the side when I can't, meaning that I know she can get our job done. Plus, I don't know if you've seen the anime, but Ceruledge's are actually pretty loyal to their trainer, so I know I can trust her.

Hisuian Zoroark: This one would protect me at all costs and be a literal demon on battle. Plus, it's majestic. We would just look good together!

Gardevoir: Same reason as above but less of a demon in battle and more of a "gone in just a black hole." Also, not really majestic unless Shiny and Mega.

Infernape: THAT'S MY BOY, RIGHT THERE!!! Oh yeah! We would be the ULTIMATE CRIME FIGHTING DUO!!! See, he's always super hyped up, so I'd feed off his energy. Plus he's strong, so I know I can rely on him in battle. We'd be a very chaotic duo!

Meowscarda: It's my distraction so that I can sneak up on the enemy. It wows those around us with tricks and stunts and I get what we need or take out who we need and we bounce.

Quaquaval: Honestly, this guy would be more of a sidekick that's purely for entertainment. Yeah, I'm sure it can fight, but it would be more fun to just have it around.