Core Changes

While the majority of the changes made to the original games lie with the Pokemon and their moves, there have been a few small tweaks made to the core gameplay mechanics in order to bring our vision for a more balanced Pokemon experience to reality.

Type Advantages
There have been a few tweaks made to strengths and weaknesses of particular types.
 * Dragon is now weak to Fighting.
 * Steel no longer resists Dark or Ghost.

Evolution
The game aims to be self-contained. This means that evolution methods that would normally require trading with another game have been removed.

List of Pokemon affected by this: 061 Poliwhirl (King's Rock now acts like an evolution stone) 064 Kadabra (Now evolves at level 38) 067 Machoke (Now evolves at level 38) 075 Graveler (Now evolves at level 38) 079 Slowpoke (King's Rock now acts like an evolution stone) 093 Haunter (Now evolves at level 38) 095 Onix (Metal Coat now acts like an evolution stone) 112 Rhydon (Protector now acts like an evolution stone) 117 Seadra (Dragon Scale now acts like an evolution stone) 123 Scyther (Metal Coat now acts like an evolution stone) 125 Electabuzz (Electirizer now acts like an evolution stone) 126 Magmar (Magmarizer now acts like an evolution stone) 137 Porygon (Up-Grade now acts like an evolution stone) 233 Porygon2 (Dubious Disc now acts like an evolution stone) 356 Dusclops (Reaper Cloth now acts like an evolution stone) 366 Clamperl (Deap Sea Scale and Deep Sea Tooth now act like evolution stones)

There are some Pokemon who have evolution mechanics that make it impossible for them to evolve in HGSS. These evolutions have also been changed.

List of Pokemon affected by this: 082 Magneton (Electirizer now acts like an evolution stone) 133 Eevee (Evolves into Leafeon or Glaceon when levelling up while holding Miracle Seed or NeverMeltIce) 299 Nosepass (Protector now acts like an evolution stone)