How do I get a pokemon with that one skill that halves egg hatching time in pokemon diamond?

There are actually two Pokemon Abilities that will let you halve the time it takes to hatch eggs: Flame Body and Magma Armor. Pokemon with the Ability Flame Body include Slugma/Magcargo and Magby/Magmar/Magmortar. Pokemon with the ability Magma Armor include Slugma/Magcargo and Camerupt.

Unfortunately, all of these Pokemon require the NationalDex in order to find them. To get the NationalDex, you need to beat the Elite Four and have seen all of the Sinnoh Pokemon, then go speak to the Prof in TwinLeaf Town. To get Magby/Magmar/Magmortar, you need to go Stark Mountain with a copy of LeafGreen inserted in your DS.

Slugma/Magcargo is also found on Stark Mountain, as well as Camerupt--all of these are Pokemon that can be caught in the wild in Diamond/Pearl so you don't necessarily have to trade them from previous versions. Once you have one of these Pokemon with the Ability you want, they only need be in your party with the Egg to hatch it quicker. If you need more help, try serebii.net ... more.

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