Mewtwo vs Pipes
http://scp-wiki.wikidot.com/scp-015Description: SCP-015 is a mass of pipes, vents, boilers and other various plumbing apparatus completely filling a warehouse in ███████. The pipes appear to grow when not under observation, attempting to connect to nearby structures via sewer systems and underground plumbing. SCP-015 contains, at current estimate, over 190 kilometers (120 miles) of pipes, ranging in diameter from 2.5 cm to over 1 m. Some pipes appear new, while others are rusted and leaking. Pipes have been reported as being made of bone, wood, steel, pressed ash, human flesh, glass, and granite. No pipes composed of lead, PVC plastic, copper, or any other traditional material for the production of pipes have been found.
SCP-015 reacts to tools and aggression. Any personnel acting violently, carrying tools, or attempting to damage or repair SCP-015 in any way, will trigger a reaction. Any pipes near the subject will burst, spraying on the subject for several seconds before the flow suddenly stops. Pipes have been reported containing oil, mercury, rats, a species of insect not yet identified, ground glass, sea water, entrails, and molten iron. Pipes will continue to burst around subject until death or retreat.
I'm going to say Mewtwo takes this easily.
