No, there haven't. Wobbuffet, Crobat, Celebi, Politoed and Scizor all existed in GSC, they were just crap or (in Celebi's case) banned.It's not like this is going through a set order. There's been ADV Pokémon already, I don't see any harm.
Swords Dance. It's the only Fire that isn't hard-walled by Chansey and one of few that can touch Alakazam. Starmie still laughs, though, and being Fire still inherently sucks. It's the only Swords Dancer besides Mew and Tangela that's guaranteed to survive two Egg Psychics, incidentally, so it is somewhat unique. But yeah, its stats just aren't good enough, it has too many weaknesses, Fire STAB is shit, yada yada you get the idea.Has no niche in OU that can't be filled by another Fire type with better results (Moltres for Fire Spinning, Ninetales for anti-leading) and thus should not be used.
Double-switching Zard into Gengar is just going to get Zard dead, since Gengar outspeeds and 2HKOs guaranteed with Thunderbolt. Charizard does beat Jynx, but it's taking 78-92% from super-effective STAB Blizzard.I'm wondering how RBY Charizard should be played in OU. I know it sucks, but I'm trying to work out a gameplan. Is the idea to para/eliminate the faster counters, switch Zard into Eggy or Gengar (?? is there anything else Charizard would even be happy to double switch into? Jynx, maybe?) and try to set up from there? Charizard strikes me as a Pokémon that's very hard to switch in and that's very easy for other Pokémon to switch into, but maybe I'm underestimating Charizard's power/coverage?
Gen2
AFAIK it became relevant once the eeveelutions got access to growth, but unlike Vaporeon was not quite as good an abuser of the boost itself, thus it would (mainly) pass them around. Don't know too much else than Growth-Passing.
All the Eeveelutions can Growth and Baton Pass. Vaporeon works well as a standalone special sweeper because of its bulk, and Jolteon makes a great passer because of its Speed and ability to threaten all phazers not named Raikou. Espeon's niche is twofold: first, it has Morning Sun for instant recovery, which Vaporeon and Jolteon only wish they had; second, it's got a far better matchup against Raikou than either Vaporeon or Jolteon. Jolteon can't avoid getting phazed because its STAB is resisted, while Vaporeon can pass (Raikou can't afford to take +1 Surfs or Hydro Pumps just to phaze) but is NOT going to like taking a Thunder to the face before getting the pass off (and the best GrowthPass target - Zapdos - is going to get walled by Raikou anyway). Espeon, however, can just kill Raikou, because it's guaranteed to survive two Thunders (and it can play for a miss with Morning Sun) while potentially getting a 2HKO with +1 Psychic.js, vap can pass growths around too, but unlike esp it can generally abuse them itself better