Get your dratini to level 36 ( i think.)
dragoniar evolves at level 55 your welcome
lvl 55
Dragonair will evolve at level 55.
dragoniar evolves into dragonite at lv 55 in all the real Pokemon games
Arbok does not evolve.
Sandslash does not evolve.
Qwilfish does not evolve.
Gyardos does not evolve.
No, Magneton cannot evolve in Pokémon HeartGold.
Ampharos does not evolve in Pokémon HeartGold.
No, Sableye does not evolve.
Corsola does not evolve