yes but you have to get the TM first
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You can't. The only move tutor who teaches Seismic Toss is in FireRed and LeafGreen. Unless you had it there, then migrated it all the way up, your charizard can't learn it. But it shouldn't learn it, Charizard has better moves like Air Slash and Flamethrower. Teach it those. Not having Seismic Toss is not a loss to Charizard. Charizard is actually not that good with his Stealth Rock weakness though.
Use HM2 to teach charizard fly.
Once Charizard has reached level 60 go to Two Island and go north you will find a house go inside and speak to the lady and make sure Charizard is the first pokemon on your list she will notice it and say she will teach it the most powerful fire attack blast burn allow her to do so and now your Charizard will have the move.
i don't think it possible
Yes. you can take it to the battle frontier and have someone teach it outrage for Pokemon heartgold/ soulsilver