Vgc team tip and rate

[Trust me I'm a ninja]

Hello I'm still very new to Vgc so I would like you help and advice, any info would be much appreciated. Below is my team I'm thinking of changing My mega but can't Find a replacement.

Landorus
Yacht berry
Protect
Uturn
Earthquake
Rock slide

Sylveon
Pixie plate
Protect
Hyper voice
Psyshock
Shadow ball

Gengar
Focus sash
Icy wind
Will o wisp
Taunt
Sludge bomb

Amoonguss
Black sludge
Giga drain
Spore
Protect
Rage powered

Mega kangaskhan
Sucker punch
Brick break
Fake out
Facade

Thundurus
Situs berry
Thunder wave
Thunder bolt
Taunt
Hidden power ice