Can't believe nobody has done this yet:
Delibird
Bottom Tier
Stats: Dear lord, Delibird, you have the stats of a NFE Pokemon. Base 65 SpAtk is only slightly better than Ariados' and Base 45 defenses is just pitiful. The only interesting thing is having 75 Base speed...as your best stat.
Movepool: Godawful, you are completely reliant on TMs to do anything at all, because your only Level up move has a CHANCE OF HEALING YOUR FOE! As for TMs, aside from Fly, Icy Wind and Blizzard, there is nothing at all interesting. As in, you have no other STAB, the only other attacking moves you get are Headbutt and Mud Slap (and obligatory Frustration/Return)...and that's it. Nothing good at all aside from Blizzard, which got nerfed considerably in Gen 2 (90% accuracy all the way down to 75% accuracy)
Matchups:
Clair: Nope, the dragons either roast you or just overpower you in general...even though you're supposed to be able to destroy them with Ice STAB?
Will: Uh...Blizzard can take out Exeggutor since you actually outspeed it, but I wouldn't count on it taking out anything else.
Koga: Theoretically you could take out Ariados and Venomoth. Theoretically, they also wouldn't be spamming Double Team while you're flying either. So yeah, no go here. Crobat's a crapshoot as well with inaccurate as hell Blizzard.
Bruno: Well, Onix trashes you if you miss with Blizzard, and the fighting types aside from Hitmonchan (who's complete trash with 3 elemental punches and Mach Punch) also destroy you.
Karen: Uh...maybe the Umbreon, since it lacks an actual attacking move outside of Bite? Vileplume maybe? Mind you, Umbreon has Sand Attack...
Lance: If Clair could beat Delibird's bum without a hassle, how would the battle against her big bro be any different? To be fair, you could TECHNICALLY beat the Blizzard 'nite...but that's a very big "TECHNICALLY".
Lt. Surge: Electric types. Next.
Erika: Not a bad matchup...FINALLY! If you haven't dumped the Santa bird by now, it can actually do well here. Just watch out for status and you should be fine.
Janine: By this time, even the trainers outside her gym are more of a threat. That's not to say Janine can't be a threat with her Weezing.
Misty: Water types...your only attack of any note is Blizzard. Next.
Blaine: Nope, he resists Blizzard and OHKOs with Fire (or Electric) attacks.
Sabrina: Her Pokemon will most likely outspeed and thrash Delibird. Blizzard isn't going to help here.
Brock: Well you could technically beat the Onix and the Golem with Blizzard, but that's assuming you're ok with being hit with 4x effective Rock Slide if you miss.
Blue: Nope, not doing anything here other than getting killed.
Red: It can't even kill Venusaur with Blizzard before it kills Venusaur back. If you want to be funny, you could just spam Fly and watch it miss with Solarbeam each time, but...
Additional Comments: Delibird has a cool sounding cry, and a unique design. It also just so happens to have a terrible movepool consisting of Fly, Blizzard, and Icy Wind. It is completely reliant on TMs to do anything aside from healing the enemy, and even then, it can't use any TMs to make it a decent Pokemon. It's stats are also on the line between terrible and godawful. It's literally worse than Gen 3 Luvdisc, because at least it could learn some moves and have Ice Beam! Avoid at all cost.