Submerge glitch

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The submerge glitch is a means of porting grass/rock Surfing glitch over to non-Spanish/Italian Pokémon Red and Blue versions with arbitrary code execution using a simple modification to RAM.

While Surfing on water, the modification of D535 (grass tile) (or D534 in Yellow)* to 0x14 (the same ID as a water tile) will trick the game into loading the water encounter table with the grass encounter rate. Hence, encounters like in the grass/rock Surfing glitch are possible provided that both a Trainer was encountered beforehand and the route used has normal grass encounters but no water encounters, including usually uncommon (due to its inaccessibility with D058) 3TRAINERPOKé₽ battles. However, after each encounter D535/D534 will be reset, hence the submerge glitch may have to be repeated.

While active, the game will place the player sprite inside the grass as expected, but because the grass was defined as a water tile it will give the illusion of the player being partially submerged in the water, hence the name of the glitch.

Non-ACE methods

Select glitch

The submerge glitch is possible in Red/Green (Japanese Blue hasn't been tested yet) using the closed menu Select glitch with 187 items, as well as specific hard to obtain requirements including 1695813 experience, 0 (or a multiple of 256) HP stat experience (EVs), and anything(?) between 16384-16639 Attack stat experience (EVs). The experience and stat experience requirements are to bring normality back to D4AA W_TILESETBANK/D4AB-D4AC W_TILESETBLOCKSPTR and wMapViewVRAMPointer respectively. Expanded inventory (Select glitch method) can be used with nickname さささささ giving the exact 187 items.

Currently this method is not ideal and could be improved.

YouTube video by Evie (ChickasaurusGL)

Arbitrary code execution

An item configuration (assuming the bootstrap code goes to item 3) to be used while Surfing on water in English versions is:

Item 3: Lemonade x20
Item 4: TM34 x53 (x52 in Yellow)
Item 5: TM13 x201

For enabling a 'simulation' of the left-facing shore tile glitch in Yellow, replace the Lemonade x20 with Lemonade x50 and run the code, then also run the following second code to set the grass encounter rate to 255 (keeping in mind not to swap stacks of an identical item as this merges them):

Item 3: Lemonade x 255
Item 4: TM34 x 135
Item 5: TM16 x 201


  • Evie (ChickasaurusGL) (Torchickens) (documentation)


* D535/D534 is +5 (D539 or D358) in non-English European versions. In Japanese versions, it is D4B4 (Red/Green/Blue/Yellow).

See also