Yes, I changed the order people put up just to put those two together.
Fighting Machamp. No other fighters come nearly close.
Psychic Alakazam. No question in my mind.
Dark Umbreon. Mean Look is just wonderful, particularly when paired with Baton Pass. Tyranitar is slightly unlucky, but this thing was a tank
Bug Heracross wrecks much face.
Fire Fire was severely underpowered compared to others types in G/S/C. I'd have to say Charizard got the most high-level competitive use, but people avoided this type like the plague.
Water: Starmie swept best, Slowbro was amazing as a wall, particularly in a Toxic/Spikes team, but SUICUNE HAS NO WEAK!
Ok, I'm exaggerating, but it was the top used water for a reason.
Oh, and Mirror Coat Blastoise or Suicune was funnage incarnate.
Electric Jolteon was ok, but couldn't really do that much but kill waters/flyers (Except the Matteon in my Toxic/Spkies team, that was awesome), and it didn't even have great defenses to be switching in to anything. Electabuzz swept much better than Jolt, but Zapdos or Raikou were THE choices.
Ground Tie between Donphan and Marowak @ Thick Club. Marowak for offence, Donphan for defence. Much better than options that have 4x weakness to both grass and rock (y hello thar Rhydon/Golem).
Grass: Grass really was underpowered. Gogo Venusaur or Victreebel though, ofc w/ Swords Dance. Just pass it some speed and it could do some unexpected damage!
Ice Cloyster was pretty decent, and used quite reguarly in competitive battles, IIRC. Ice attacks were usually covered by the water type in the team, however
Rock Tyranitar. Rock wasn't used a heap though. Aerodactyl was pretty cool too though.
Ghost Gengar. Ptrapper, Special Sweeper, Annoyer, could fill so many roles.
Poison: Gengar, even if you never used his STAB on any moves. If we restrict it to pokemon who would actually use poison moves with STAB, probably Swords Dance Victreebel or Venusaur again.
Flying Dodrio was a beast if played right. Zapdos completely outranks it though.
"I prefer the wicked rather than the foolish. The wicked sometimes rest." - Alexandre Dumas