You get him through trade. You need a slowbro, then go to Fushia City, go to tower thingy that leads to the cycling road. Go up the stairs and there will be a person. Talk to him and he will offer you a trade. The other option is cheats.
You can't mantyke doesn't exist in leafgreen.
You have to trade with emerald of ruby to get groudon in leafgreen.
This TM doesn't exist in leafgreen.
you cant go underwater in leafgreen!!
you can not reduce evs in leafgreen and firered
Go to the town with a ice gym, (Mahogony town I think) and begin walking toward ice cave or ice path, on your way there will be a route with a small patch of grass. lickatongue can be found there
To evolve Lickitung, you'll have to teach it Rollout, and level it up. It will then evolve into Lickilicky.
Next to mohogany town if you go right and you surf to the middle of the water you will find wild lickitung.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Norman is not in leafgreen.
Firered and leafgreen both can catch different Pokemon but there pokedex is the same, here is some examples: magmar only in leafgreen not firered, oddish in firered not leafgreen, ekans in firered not leafgreen, bellsprout in leafgreen not firered, pinsir in leafgreen not firered.
in leafgreen u have to get it from a Nintendo event and in sapphire after u get it in leafgreen u trade it from leafgreen to sapphire
The lottery is not in leafgreen.
There aren't growlithe in LeafGreen. FireRed has growlithe, LeafGreen has vulpix.
Shuckle is not available in Leafgreen. You will need to trade one from Emerald to Leafgreen.
Yes.
You can't get it in leafgreen.