Likely a sterile medium means an uncontaminated culture (food free of living organisms) that will grow only the new bacteria introduced for analysis. Source(s): http://www.thefreedictionary.com/sterile
Stonepelt was Bluestar's first mentor and a very well-respected senior warrior of ThunderClan. It is revealed in this book that he took her to the Gathering on her second day as an apprentice because she had caught a squirrel very well for a new apprentice, and the squirrel had been as big as she was.
Rock Arceus is also notable for being one of the few Calm Minders to actually beat Ho-Oh, thanks to its Rock-type Judgment. Rock Arceus is also a usable Swords Dance sweeper with either Rock Slide or Stone Edge.sychic Arceus is the only Arceus that is totally outclassed across the board. Generally, Ghost Arceus is better than Psychic Arceus in almost every way imaginable, and the many Psychic-types of Ubers also offer stiff competition for this Arceus in other regards.