Pokémon Diamond and Pearl introduce the Physical Special split. What this does is make certain moves physical and some special compared to RB/GS/RS. Those games did it with the type as a way to decide. For example, all Fighting type moves were Physical, and all Dark type moves were special. For example, Bite, a move that used to be Special (i know! sounds weird) because it is a dark type move, is now a Physical move. On the contrary, Hyper Beam, a move that used to be Physical because it was a normal type move, is now a Special move. This really helps out pokemon that had stats based on being physical but had a type that was special (like Kingler, Sneasel and Crawdaunt) or the contrary, Pokémon with physical types that were special attackers (like Gengar and Misdreavus) However not everything benefitted, because Alakazam lost the element punches as coverage and Sceptile lost leaf Blade as special STAB.