Jolly Garchomp's Outrage even deals
73.42% - 86.26% to 252 HP / 252 Def Bold Cresselia (after a SD), potentially a 2HKO which is very impressive compared to Salamence which he has to do a Draco Meteor, then Outrage two times. Garchomp has better typing, great stats, learns the best type coverage in the game with STABs on 2 (Dragon/Fire/Ground) and is resisted by none (I am pretty for sure). Garchomp learns Swords Dance unlike Salamence, and is in a Speed tier that no other Pokemon is in (102 I think) not causing a Speed tie. It also was centralizing the metagame back then, where there was a Garchomp on EVERY team lol. It also has too much ease on sweeping, even 2HKOing Hippowdon (I think). O_O Salamence has a counter, Porygon2, which almost garantees that Salamence will always go down before it. Seriously, they are two different Pokemon, and Smogon knows how to ban Pokemon. A lot of people are actually happy he is banned lol.
Edit: Garchomp doesn't even require that much prediction, meaning it can be used by almost by anyone easily. Even Hippowdon is a bad counter since it just allows Garchomp 20% more evasion thanks to Sand Veil. A lot Garchomp have been holding Yache Berry to stop Ice Shard users. Stats also don't determine everything... Making stuff like Fire Blast VERY bad accuracy.
Edit 2:
It gets STAB Seed Bomb, which has an 80% chance of lowering Sp. Def,-
You mean Seed Flare? =P
Edit 3: Oh, and it is resisted to Stealth Rock. XP Oh, and SpA doesn't matter if he has Swords Dance and can 2HKO even the best physical walls in the game. Salamence's Atk is only 5 points higher. Garchomp is bulkier, and can even set up a 101 Sub.