As far as I know, the move Flare Blitz is not a TM and thus cannot be purchased or found in the field. It is instead learned by select Fire-type Pokemon via a level-up. Two such Pokemon are Infernape and Rapidash.
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You can not buy Pokemon from the game corner in Pokemon diamond, but you can in heartgold and soulsilver
well i have 100% completion in Pokemon diamond, pearl and platinum and if you ask me out of 10 your attacks are Flamethrower:8 Flare Blitz:7 Blast Burn:9 Focuz Punch:8 but concidering your infernape is a lvl 100 it might raise any number by one so 9 would become 10 and 7 to 8 and 8 to 9 but that's just my opinion oh and jsyk if you buy a white dsi you get giratina origin form holding a masterball.......
No, you can't buy berries in Pokémon Diamond.
No way!
buy it at the rare Pokemon store