What Reenee's saying is that whether a move is based on Attack or Special Attack is now exclusive to the move itself, not just the type of the move. For example, Hyper Beam is a Normal Type move, but it is not a physical attack, so Special Attack is used in the damage calculation. Another example of this when comparing two moves of the same type: Flamethrower is a move based on Special Attack (not a physical attack) but Fire Punch is based on Attack, because it's physical. It's all listed in-game on the screen that tells you the base attack/accuracy of the attacks, so it's not really that hard to figure out.
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