Open VBA/game
"Cheats" in the emulator context is setting memory addresses.
Cheats -> Search for Cheats
In Cheat Menu -> Start (Sets original memory address values to reference)
Check Box for Search Updates Values (Updates values every time you search.)
Walk one step right, search "Not equal to" "Old value", walk one step right, search "Not equal to" "Old value" advance a few frames holding still, search "Equal to" "Old value"
After numerous searches like this, you should eventually get narrowed down to 20 values or so, one or more of which reflects your x position. (You also need to find your y position by walking only up and down.)
When you find the address you want to set, go to add cheat, set the value you have inferred for the position you want, and enable cheats. (The option is "disable" so uncheck it.)
I didn't revise all of this, but it should give you the correct idea of what you need to do.