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The Xenomite evolution line (ATK), in addition to the Cocaran line (Sp ATK), are the only Pokemon part of a 3 stage line that have a base stat which never increases.
Xenogen is based on the Chestburster, the third stage of a xenomorph's life cycle
Xenogen originates from the word xenomorph, in reference to Ridley Scott's Alien movie franchise. Xeno may also derive from the prefix "xeno-", which is generally used in taxonomic names to denote strangeness. The "gen" part of the name comes from genetics.