There's certain Pokemon that I just don't want to use if blowing through a regular battle or (god forbid) a tournament situation. Some of them have movepool issues, some of them are too slow for an ingame rush, and some of them spilled ink on GameFreak staffers at the time of their development and lose on all counts as a result.
But there's one I have hated for nearly 10 years, to the point where I actually built entire GSC teams around getting it out of the way when I played competitively. One of my greatest moments was shutting up an annoying git on the bots with an Alakazam, and only because it had Psychic, Fire Punch AND HP Dark.
It's the fat egg.
If modern tiering rules were in place at the time of GSC and the bots weren't run by someone who got nuked from Azure Heights due to not knowing when to quit arguing with He Who Has The Button, I have no doubt that the egg would have been the first or second suspect (behind Snorlax) and probably banned for severely imbalancing the game. At the tail end of the game, it was being used even more than Snorlax - something like 35% of the time. Granted, there isn't as much choice (or as many battles) on GSBot then there would be on modern Shoddy, so it's not as impressive than Scizor getting 25% now. But at least Scizor (and Snorlax then) were actually doing damage.
Check that Bulbapedia link above again. Look at the base stats. They're like modern Garchomp - perfectly designed to be gamebreaking. Now consider that the equivalent of EVs in the 2nd gen allowed you to max everything. Imagine if natures existed in 2nd gen and the defense boost existed.
As it is, it had 1 true counter - and that required a 10% boost item since the Choice items didn't exist yet. It's imbalacing on the defensive end because it can recover constantly and has a perfect Counter for any physical attack you care to throw at it. It shouldn't take an hour and a half to have one battle, but I had more of those than I care to count.
I took a sabbatical from battling after Ruby and Sapphire were released, largely due to the fact that I was sick of debating the cheapness of Beedrill (I'm not saying you can't battle with it, I'm saying right now we can't use it so why bother programming it in). Once this got sorted out, I dipped my toes back into it when I wasn't e-fedding... and then I read blueshirt's moveset FAQ. Which includes, and I quote:
in the description of Regice.
Yes folks, the Pokemon that single handedly made half of the attacks in the game UNUSABLE was back and worse than ever.
I haven't been back since.
Though I have thought about it again - the pendulum has swung so far to the physical side that Blissey is down to about 11-12% usage instead of 33%. Still, is there anything that can be done to nerf it?