poo in your pants
You don't actually get any reward but you just get a time for beating old man lobber. So after you beat him you basically have completed all the courses of the whole game.
You first meet him in Hotcha Springs, but when you fight him, you find him in the last level of "???".
Go to weiner snichzels and ask for your weinie :) with ketchup
Get 10 pearls and run away! (Run away by holding down B or Y and left or right on control pad)
defeat all 7 gym leaders in kanto then the old man will move
You get surf from that man after you defeat the tim rocket grunt that is in the stage.
bobber, cobber, clobber, lobber, robber
robber; fobber; bobber, clobber, slobber, macabre
If you are talking about the last boss of the last stage in the 'main story' it is Mashtooth who is a space pirate and has two parts one harder than the other. If you mean the VERY last boss in stage 10 then it is Old Man Lobber who is much harder than Mashtooth.
You must defeat the eighth gym leader, Clair. Clair uses Dragon-type pokemon, so bring an Ice-type or Dragon-type. Once you defeat her, the old man will move, allowing you to pass.
Plant Man is weak against the Blizzard man attack. Switch to Blizzard man's attack and you will be able to defeat Plant Man in seven hits.
Heck ya he could defeat anyone!