SoulSilver Elite Four First and Second round team help

WEll, I havent played my SS in awhile, and recently restarted it. Since ive been out of touch, I dont want to blunder through the Elite Four when I get to em, I want to breeze through them. So heres the team I have come up with. I was wondering if yall could help with refining movesets and the items I should use to maximize efficiency and amazingness. And also around the level I should have em all at. Thanks.

Typhlosion

-Flamethrower
-Eruption
-Fire Blast
-Fire Plume

Ampharos

-Thunder
-Thunder Punch
-Thunder Shock
-Thunder Wave

Gyarados

-Surf
-Ice Fang
-Dragon Rage
-Dragon Pulse

Lugia

-Aeroblast
-Extrasensory (I think he starts out with this move)
-Fly
-Psychic


Gengar

-Shadow Punch
-Shadow Ball
-Dark Pulse
-Sucker Punch

Dewgong
-Aurora Beam
-Sheer Cold
-Aqua Tail
-Ice Beam


Before I take on the Elite Four a second time, ill be switching out Dewgong for a Mamoswine, if i can get it. So yeah.. Just tell me anything I might need to fix, and what items and where to get em.. Thanks xD.