Well, Yes it probably is fake
I actually don't think the label has anything to do with it however, as I have a Pokemon Quartz Cartridge (Which is not an official Pokemon game :P) which says 'Official Nintendo Seal of Quality'. However, a real game should have The Pokemon Company next to Nintendo.
Another way to check is the model number on the back of the cartridge;
The model number - On the back of each Gameboy Advance cartridge, there is a model number. Every Pokémon game's model number is "AGB-002". If your begs to differ, than its probably a fake, for example, my fake Emerald says "AGB-004, rather than -002.
Anyway the following websites might help, since I could be wrong.
Bloop 1 and Bloop 2