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You must remove from play at least 1 Rock-Type monster in your Graveyard in order to Special Summon "Megarock Dragon".
The only way you can Special Summon this card is via its own procedure. Even if it was initially summoned that way, you still can't summon it with card effects.
The original ATK of "Megarock Dragon" is determined by its effect. This is further doubled/halved by "Megamorph" and other effects that are based off of original ATK. So if you Special Summon "Megarock Dragon" with an original ATK of 2100 points, then equip it with "Megamorph", its ATK will be 4200 or 1050 depending on your Life Points.
If this card's effects become negated, or if it is flipped face-down, its ATK becomes 0.
If "Skill Drain" is active while "Megarock Dragon" is in play, the effect of "Megarock Dragon" is negated and its original ATK and DEF are treated as zero. Even if "Skill Drain" is destroyed later, the original ATK and DEF of "Megarock Dragon" will remain zero.
If "Megarock Dragon" is flipped face-down, or removed from play, or sent to the Graveyard, its effect is wiped and its original ATK and DEF are zero.
If you Special Summon “Mega-Rock Dragon” with an original ATK of 2100 points, and you equip it with “Megamorph”, its current ATK will become 4200 or 1050 depending on your Life Points.