So far it is a psychic / ghost type that is 600 kgs, has a head and upper limbs and is purple
Unnerve or Intimidate I guess?
When it enters battle it causes an earthquake because of it's weight
It is immune to everything
Truant
Because
Either Infriltrator (Spiritomb's Ability) or Wonder Guard (Shedinja's Ability)
It has 1 hp
It has sturdy
Every time sturdy activates
It gets +10% atk
And can stack up to 50 times
(shedinja but insane)
Ability that makes every move ohko and bypass abilities and sub and protect
What do you think?