An implementation of Volt Switch (and U-Turn) for Fire Red.
After making its attack, the user rushes back to switch places with a party Pokémon in waiting.
If necessary, change move_scripts in constants.s. The given address of this table is for MrDollSteak's patch, so if it is there, you will not need to modify this. This is the table of move effects to be assigned directly to moves.
Update EFFECT_VOLT_SWITCH in constants.s. This will be the effect id that gets assigned to Volt Switch.
If necessary, change move_cmds in constants.s. The given address of this table is for MrDollSteak's patch, so if it is there, you will not need to modify this. This is the table of commands for move scripts (e.g. attackcanceler and attackstring).
Update ATK_JUMPIFBATTLEOVER in constants.s. This code adds a new command (jumpifbattleover) and it will need an unused move script command id to be inserted.
The build script will search for adequate free space, but if you need to insert the code in a particular place, you can tell it where to start looking by modifying free-space in config.ini. If the given address is acceptable (i.e. is word-aligned and has enough bytes of free space), it will be inserted there.
Click here for build instructions.
Open a move editor and go to Volt Switch. Make sure that the move's effect matches what you set as EFFECT_VOLT_SWITCH.
Naturally, do the same for U-Turn.
If a Pokémon faints from Volt Switch and the opposing trainer still has more Pokémon, experience will be split between the Volt Switch user and the Pokémon that gets switched in. If a trainer's final Pokémon faints from Volt Switch, however, no switching or experience splitting will occur.
Original implementation by MrDollSteak. The only functional differences between the one here and there are that this one doesn't force a switch out when the battle is ending, and that this one doesn't switch out if the target is immune.