You probabally just caught him like that, try leveling him up one or two levels then he might evolve. Also make sure he's not holding anything because that might hinder the process.
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well my bagon didnt evolve till it was lvl 40 i think try tht kk but it should become a shelgon on level 30, so then something happened to your bagon
Pidgeotto evolves starting at Level 36. At Level 18 , Pidgey evolves into a Pidgeotto and at level 36 Pidgeotto evolves into a Pidgeot.
Charmeleon evolves into a Charizard at level 36.at level 36
level 36! all starter pokemon evolve at level 36.
Combusken will evolve into Blaziken in level 36.level 36