Ryuutaros
"Training."
Because though the story was a bit bland ( you sure? The mystery surrounding the grongi was exciting to me) the plot was well written and well portrayed. The enemy actually dealt "real damage" aka leaves wounds and scars on the armour.
Its also the closest you can get to a serious rider. No super finisher, no imba rider. It was a fight of tooth and nail even to the end.
But yea..........the big boss fight to me was like "WHAT????? YOU CALL THAT A BOSS FIGHT?? DID YOU GUYS RAN OUT OF BUDGET?? "
The final battle was not meant to be flashy.