Super Mario Galaxy 2

Super Mario Galaxy 2 is a platforming video game developed by Nintendo for the Wii. It was first announced at E3 2009, and is the sequel to Super Mario Galaxy. It was released in North America on May 23, 2010. The game's levels are galaxies filled with minor planets and worlds. While its gameplay is based on that of its predecessor, the game was updated with gravity effects and new power-ups. It is the fourth original 3D platformer in the Mario series, after Super Mario 64, Super Mario Sunshine, and Super Mario Galaxy.

Language Region Mismatch
The Wii language setting must match an acceptable language for the region of this title being played: Japanese for SB4J; Korean for SB4K; English, Spanish or French for SB4E; English, French, German, Italian, or Spanish for SB4P; and Traditional Chinese for SB4W. Due to region checking built into the game, if an unacceptable language is set emulation hangs.

Wii Remote Lag When Collecting Starbits
The Wii Remote slows down when collecting starbits. To remedy this, go to Dolphin Controller Configuration Window and disable (untick) Enable Speaker Data and this will mute the Wii Remote speaker, fixing the starbit slowdown problem. Seems like it might have something to do with the computer's Bluetooth dongle not granting enough bandwidth for the Wii Remote to receive the sounds and transmit controls at the same time. It's a problem bound to PC hardware and driver, you can also try Bluetooth Passthrough.

Problems
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Boss Roars
Boss roar effects are not visible. See.

Yoshi Not Eating Items In Direct3D 12 Mode
In D3D12 the red circle around edible items sometimes doesn't appear. Using a savestate and restarting the emulation fixes it temporarily. The DirectX12 backend has been removed.

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Higher IR Effects Fog
Using IR > 1x causes fog to be rendered at inappropriate depths. Native internal resolution must be used to avoid this. This can be seen on the save select screen, the ship post the first level, and other areas. Refer.

HD Texture Pack
Super Mario Galaxy 2 HD Texture Mod - Dolphin Forum Thread

Project was almost complete but now seems to be abandoned.