A Bag of Dragonite (ドラゴンパウダー, Dragon Powder) is an item in EarthBound which when used, "transforms" a party member into a dragon, allowing them to deal a massive amount of damage to most foes (with the exception of Giygas). It can only be used once, and it is a fairly rare item with only six available in the game.
Sometimes, the attack is so powerful that it can inflict mortal damage on one of the party members, often the one near the user.
'Dragonite' comes from Dragon and the suffix -ite, common in stones and minerals.
The name "Dragonite" is also seen in Pokémon as the English name of the 149th Pokémon.