you might have an everstone attached. oh wait..... if you caught him or her at that level, then you just need to level it up 1 or 2 levels.
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No. Bagon evoles into Shelgon at 30 and Shelgon evolves into Salamence at 50.
If you just level it up one then it will evolve. Then level it up to level 50 for a salemence.
level 35
Level 35
Get him to level 35 and he will evolve into Altaria.