Likitung must know the move rollout to evolve. It is the only Pokemon whichn evolves in this way. If you told it to forget this move go to the house closest to the water in Pastoria City and get the man to teach it the move again. You will need to have a heart scale though and these can be found by mining in the underground using the explorer kit. Once he has learned rollout just level him up a bit and he should evolve :)
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Lickitung can be found in the Safari zone as well as a small island patch which is, if I remember correctly, north east of Cerulean City (between the city and where you find Misty on her date)
Sun Stone -use on Sunkern to evolve into Sunflora and on Gloom to evolve into BellossomMoon Stone-use on Nidorina to evolve into Nidoqueen, Nidorino to evolve into Nidoking, Jigglypuff to evolve into Wigglytuff, Clefairy to evolve into Clefable or Skitty to evolve into DelcattyFire Stone-use on Eevee to evolve into Flareon, Growlithe to evolve into Arcanine or Vulpix to evolve into NinetalesThunderstone-use on Pikachu to evolve into Raichu or Eevee to evolve into JolteonWater Stone-use on Eevee to evolve into Vaporeon, Staryu to evolve into Starmie, Shellder to evolve into Cloyster or Lombre to evolve into LudicoloLeaf Stone-use on Gloom to evolve into Vileplume, Exeggcute to evolve into Exeggcutor or Nuzleaf to evolve into ShiftryShiny Stone-use on Togetic to evolve into Togekiss or Roselia to evolve into RoseradeDusk Stone-use on Misdreavus to evolve into Mismagius or Murkrow to evolve into HonchkrowDawn Stone-use on a Female Snorunt to evolve into Froslass or a male Kirlia to evolve into a GalladeOval Stone-Happiny has to hold during the day to evolve into Chansey
Gastrodon doesn't evolve.
Five different Pokemon evolve using a Sun Stone. Gloom will evolve into Bellossom. Sunkern will evolve into Sunflora. Cottonee will evolve into Whimsicott. Petilil will evolve into Lilligant. Helioptile will evolve into Heliolisk.
No, it does not evolve