if you show him the Pokemon he will give you a certain stone in this order
lickitung everstone (big tongue)
growlithe fire stone (Loyal wiyth big roar)
staryu water stone (red circle in centre of its body,star)
oddish leafstone (leaf on its head)
pichu thunderstone (cant remember) but yea you need a pichu
Lickitung or its evolved form LickyLicky
Im not sure if it is any different, but on my brothers game, who has Heart Gold ( I have Soul Silver) and he needed an Oddish.
Edit:
Just did this on my own Heart Gold game:
firstly he wants to see an Oddish - then he'll give you a leaf stone
next for me was Growlithe - after which I got a fire stone (yay I can finally evolve him!)
then Jigglypuff - everstone
then Pichu - thunderstone
then Marill - water stone
That's all of 'em, hope that helped, good luck catchin 'em all! :) ><>
In HGSS its lickitung, oddish, staryu, vulpix, then pichu in that order. :D
he first wants to see lickitung,then he will give you a everstone,then he wants to see a skiploom.
he wants to see a lickitung. i don't know where to get them.... sorry.... hope i helped anyways! all the Pokemon he wants to see are. lickitung. oddish. vulpix/growlithe. i don't no the last one but i think its staryu or vaporeon
Lickitung
growlithe
you can get any Pokemon that you want.
To delete a Pokemon you don't want in Pokemon gold you have to go to a PC, go to Bill's PC click on withdraw or deposit, click on the Pokemon you don't want and click on release. It's that easy!
If you are refering to the pokemon that Bill's grandfather wishes he could see, then you want an Oddish.
Bill is not in Pokemon Sapphire. He is only in Red, Blue, Yellow, Gold, Silver, Crystal, Fire Red, and Leaf Green.
A pichu.
Why do you want it, its terrible.
You must defeat the elite 4, then go to mistys city, then north. Talk to Bills grandpa, and he want to see Pokemon. I think it is theese Pokemon he wants to see. Lickitung, Staryu, eevee, Pichu>>Set pikachu at the day-care with a ditto, in the egg it's a Pichu<< he want's to see a vulpix too. That is for silver, in gold can't you catch a Vulpix, so i think it's a growlithe instead.