Gabite evolves at level 48. In Pearl you need to catch a gabite and evolve it and in platinum you can catch a wild gabite at victory road on your way to the league. HOPE THIS HELPED
How To Evolve Gabite On Pokemon Platinum?
You need to level him up to 48 (can just go under the cycling road to get a gible and evolve it to gabite,which was easy for me)
Get it to level 48.
Level up to 48
Level it up to level 48
Get gabite to level 4or level 48 I'm not shure .
Level 48 find it in the secret wayward cave for gible evolve lv 26
It evolves into garchomp at level 48. .
WRONG WRONG WRONG.
Level 48. To hell with it being happy it can be miserable and hate you, it will still evolve at level 48
Level 48. To hell with it being happy it can be miserable and hate you, it will still evolve at level 48
On level 48 in evolves. (Don't trust answers like 'you use a stone' or something. This actually works!)
The guy who said his gible evolved at lv26 is wrong it is lv24 by jack morley
Just get it to lvl 40 /for purge just Give it a dubils disk at lvl 40 you get gabite at victory road
Give it a soothe bell and raise it during the day to level 40 and above it evolves if you give it a dubios disc it evolves into a purge if you don't know what that is then look it up at purge pokemon .com hope I helped
The only way is to level him up to 47