is there a place where you can find flash cannon on platinum

Question

i used it the first time but accindently made my empoleaon forget it where can i get it again

Answer 1

In Platinum you cannot get it again. However if you have HeartGold or SoulSilver you can get it once on Route 9, or sometimes as a prize on Tuesdays in the Goldenrod Department Store lotto. Then trade the item across, or trade your Empoleon, teach it, and trade it back to Platinum.

Otherwise you are out of luck. The only other way is to breed a female Empoleon with a male Blastoise that learnt Flash Cannon by level up. But then you're starting from level 1 again...

Answer 2

You could only obtain TM91 Flash Cannon after defeating Byron, so I don't know any other place to obtain it sorry.