No, none of those Pokemon can learn Psychic.
No, Sceptile cannot learn Blizzard.
blaziken can learn ice punch
Most water and ice types can as well as psychic types. Here are some examples: Mewtwo, Swampert, Vaporeon, Articuno.
Swampert does not learn Hydro Pump.
Blaziken does NOT learn flamethrower. but torchiccan. at level 42 i think!
Blaziken cannot learn Flamethrower by leveling up but it can learn Flamethrower via the TM 35. Blaziken's pre-evolved form Torchic can learn Flamethrower at level 43.
The only way for Swampert to learn hydro pump is to let Mudkip learn it at level 42, sorry.
The most powerfull attack Sceptile can learn is: Frenzy Plant!
what i learnd OS with my blaziken it learn sky uppercut at lvl 57but that is what i think
no
Sceptile, to my knowledge, is incapable of learning Night Slash.
Lapras cannot learn psychic by natural means. It can learn TM29- Psychic.