The pseudo-legendary type — every generation has one.
Dragon is the prestige type. Every generation since Gen 1 has introduced at least one pseudo-legendary Dragon (Dragonite, Salamence, Garchomp, Hydreigon, Goodra, Kommo-o, Dragapult, Baxcalibur) — Pokémon with 600 base stat totals that dominate their generation's metagame. Dragon resists Fire, Water, Grass and Electric, has only four weaknesses, and hits Dragon for super-effective damage itself.
Dragon is the closing-sweeper type. Dragon Dance (+1 Atk, +1 Spe) is the most broken setup move in the game — one turn of setup and you outspeed and one-shot most of the opposing team. Choice Scarf Dragon revenge killers and Assault Vest tanks are the two other major archetypes.
Draco Meteor (130 BP, drops Sp. Atk two stages) is the one-shot nuke. Outrage (120 BP, locks user in) is the physical version. Dragon Pulse and Dragon Claw are the weaker-but-consistent options.
The Dragon type had no super-effective physical move until Gen 4's Dragon Claw and Outrage. Before that, Dragon Rage (40 fixed damage) was the only Dragon attack in the game — which is why Gen 1 Dragonite was almost never used as an actual Dragon attacker.