Pokémon Bloody Platinum

Pokémon Bloody Platinum is a rom hack of the 4th generation Pokémon Platinum game in which the level of the game has been modified as well as some sprites (Prof.Sorbier replaced by Prof.Chen for example), and where the Pokémon encountered in the tall grass and the trainers you fight have been changed, making it a much more difficult game than the original.

The possibility of catching all 493 existing pokémon in the high grass, the legendary Pokémon being extremely rare.

The ability to naturally obtain in-game items that unlock Darkrai, Shaymin and Arceus event pokémon.

Pokémon that normally evolve by exchange now evolve by level.

More variety when fishing with the rod (we're sick of Magicarpe).

Wild pokémon are much more powerful (up to level 90).

The starters are Tiplouf, Etourmi and Lixy

Arena Champions, Council 4 and League Master are much more difficult.

Nuzlocke challenge, making the challenge more difficult.