I've been waiting years for this. The fire effects on Klonoa 2 now work on at least one specific build of pcsx2 so far!
Many many many Thanks to turtleli and prafull for the fix!
Klonoa 2 NTSC works fine.
Klonoa 2 NYSC-J works fine
Klonoa 2 PAL works fine in 50hz mode. 60hz mode gives a black screen with this error though I think it is due to the IPU patch trying to use the 50hz address still.