Hi, I'm working on a PokéRide implementation in Gen 3, specifically FireRed.

FBI, I've updated the OP with a video (https://streamable.com/8u23z).

After figuring out how to keep the Pokemon from being registered as being seen/caught (thanks to Burtle), I have ported the routine from Skeli's ROMbase to vanilla FireRed. Just got to do a myriad of checks for Lapras and Machamp. Then I'll work on Charizard Glide.

Insert this code into free space:

.text
.align 2
.thumb
.thumb_func

main:
sub r1, #0x01
lsl r1, r1, #0x01
add r1, r1, r0
ldrh r0, [r1]
push {r0}
ldr r0, flag200
bl flagcheck
mov r3, r0
pop {r0}
cmp r3, #0x01
beq laprascheck
push {r0}
ldr r0, flag201
bl flagcheck
mov r3, r0
pop {r0}
cmp r3, #0x01
beq machampcheck
end:
ldr r3, =(0x080432b7)
bx r3

flagcheck:
ldr r3, flagget
bx r3

laprascheck:
cmp r0, #0x83
beq uncatch
b end

machampcheck:
cmp r0, #0x44
beq uncatch
b end

uncatch:
mov r0, #0x00
mov r5, #0x00
b end

.align 2
flag200: .word 0x00000200
flag201: .word 0x00000201
flagget: .word 0x0806e6d1

then compile this and insert it at 0x080432A4

.text
.align 2
.thumb
.thumb_func

ldr r3, =(0x08XXXXXX)
bx r3

where 0x08XXXXXX is the offset you inserted the first routine at +1

You'll notice my method uses givepokemon. Set the relevant flag (0x200 for Lapras, 0x201 for Machamp) before giving the pokemon. Afterwards, clear the flag.

.text
.align 2
.thumb
.thumb_func

main:
sub r1, #0x01
lsl r1, r1, #0x01
add r1, r1, r0
ldrh r0, [r1]
push {r0}
ldr r0, flag200
bl flagcheck
mov r3, r0
pop {r0}
cmp r3, #0x01
beq disattiva

end:
ldr r3, =(0x080432b7)
bx r3

flagcheck:
ldr r3, flagget
bx r3

disattiva:
mov r0, #0x00
mov r5, #0x00
b end

.align 2
flag200: .word 0x00000200
flagget: .word 0x0806e6d1

You could simplify your routine in this way. In practice, if the 200 flag is set, no pokemon will be registered. It saves space and a lot of time, in case a lot of pokemon are added.

.text
.align 2
.thumb
.thumb_func

main:
sub r1, #0x01
lsl r1, r1, #0x01
add r1, r1, r0
ldrh r0, [r1]
push {r0}
ldr r0, flag200
bl flagcheck
mov r3, r0
pop {r0}
cmp r3, #0x01
beq disattiva

end:
ldr r3, =(0x080432b7)
bx r3

flagcheck:
ldr r3, flagget
bx r3

disattiva:
mov r0, #0x00
mov r5, #0x00
b end

.align 2
flag200: .word 0x00000200
flagget: .word 0x0806e6d1

Sorry for replying old post.
I dont find how to make the item pokeride, only routine for that.
what offset for the item?

It appears the user who posted the tutorial was deleted since there are no records of their messages or a notice showing it was deleted by a mod/admin. With the current information the tutorial is useless since it is missing important information. Maybe someone did a backup of the tutorial and can repost it.