Pokemon I didn't use in Pokemon Y!

I decided to make this as some kind of "curious stuff" list.
I thought it would be fun to take a look at the pokemon I caught and used a bit while on my playthrough of Pokemon Y, but ended up being replaced by others for some reason.

The team I used to beat the game was Greninja,Charizard,Shiny Gengar,Lapras,Lucario and Aerodactyl.

Here are all the Pokemon (or at least the ones I can remember) I didn't use to beat the game:

Hippo The Male Hippopotas
You guys know that path that gives you access to Glittering Cave, where you have to walk on a Rhyhorn's back?
Hippo was my first encounter in that place, and since I love Hippopotas, I caught him!
I leveled him up to I think level 21 then I stopped using him for unknown reasons (yes, I forgot why I stopped using him).
I'm currently training Hippo so I can actually use him because I regret not using him ;w;

Rocky The Snorlax
Snorlax. the pokemon that looks the most like me (because it's fat and I'm also fat).
You guys know (of course you know, don't f///ing lie to me, I'm not stupid) the Snorlax that blocks the bridge in Route 7?
When I found out there was a Snorlax in there and I could catch it, I was "OH BOY!! CONSIDER IT MINE, BABY!!!", so I interacted with the Snorlax and started making weaker so I could catch it easily, it still refused to stay in the ball for a while but I ended up catching him and calling him, yes, Rocky!
I still used Rocky against Tierno and Trevor, but after searching a bit, I found out Snorlax had a slow leveling rate, and Rocky wasn't really keeping up with the rest of the team in leveling up sooooo...yeah I stored him in the PC.
Sorry Rocky ;--;

Fluffy The Sentret
.....Who would reject a cutie like Sentret?
I stopped using Fluffy because....meh Furret isn't really a strong pokemon and I don't really like using a pokemon as a HM slave.

Blade The Honedge
.....I left Blade behind because I didn't know exactly when to use a dusk stone on him after he evolved into Doublade, stupid reason right? I know, I know.....

Link The Helioptile
I caught Link after catching Hippo, in the same location.
I left him behind for the same reason I didn't use Blade, I didn't know when to use the sun stone to evolve him.........hhhhhhhhh

Karen The Female Pikachu
I caught Karen in the Santalune Forest, after getting Alpha The Froakie.
I still used her in the first gym, but I ended up storing her too, I forgot why though. heh

Snubbull--->Granbull
This one still evolved after fighting a Team Flare Grunt.
I didn't use her/him (I can't even remember if it was male or female) because I decided to try catching a better fairy type.

Sylvie The Eeve--->Sylvie The Sylveon
This one also evolved, Sylvie was caught as an eevee after I decided to stop using Granbull.
I can't remember why I left him behind though, I just remember storing him in the PC....

Sparko The Electrike
I caught Sparko after I caught Granbull when he/she was still a Snubbull.
I also used Sparko against the Team Flare Grunt, but just like I did with Sylvie, I just stored him in the PC and forgot why I didn't use him.
I think I stopped using Sparko because I found out that Manectite (the mega stone that allows Manectric to mega-evolve) was exclusive to Pokemon X. (GameFreak sure is a genius, ain't it?)

Lurky The Golett
Some of you may know that I AM A HUGE FAN OF GOLURK.
I stopped using Lurky because of the ability it had when caught, Klutz.
A pokemon with the ability Klutz does not receive bonuses from stuff like the EXP Share, lucky eggs and can't use any held items.
So I depositted Lurky in the PC, sorry Lurky ;w;

Chomper The Tyrunt--->Chomper The Tyrantrum
I got Chomper as a Tyrunt after reviving him from a fossil, I still used him for quite a while, but he wasn't keeping up with the team's levels, he was starting to be the weakest member of the whole team.
I started using him again in the post-game, that's why he evolved into Tyrantrum.

Those are all the Pokemon I can remember I didn't use, I'll update this list if I find more pokemon I didn't use.