Besides stuff everyone knows, like BFES, World Rev, The Extreme, Still More Fighting, Force Your Way, Battle on the Big Bridge, etc?
Illusion of Gaia: final boss -
SMT:DDS2 : Divine Entity -
FFL2: final boss -
DFO: Behemoth Boss 1 -
Goldeneye: Antenna Cradle -
SSBB: Dedede -
Touhou 3: Strawberry Crisis - (I'm sure there are much better Touhou suggestions, but I'm not a Touhou guy)
Amplitude: Nitro Narcosis - (depends on your definition of battle, and I suppose also intense)
GGX: Still in the Dark -
SMB: Lil Slugger -
GH3: Devil Went Down to GA -
How much intensity do you require? Does it have to go to 11? (Some of these stop at 10.)