first you need to go to celadon city game corner, activate the poster on the wall. and defeat the team rocket boss. from this you will gain a silph scope this enables you to see the ghost, and defeat it
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You need the Silph Scope to see it, then defeat it.
Train every Pokemon to level 100, catch all the Pokemon, receive the diploma, collect all the stickers and defeat the trainer tower.
Gyarados doesn't any further on Pokemon FireRed.
All pokemon's highest level is 100.
Dragonair evolves at Level 55 in Pokémon FireRed.