What is pkrs?

well, this may or not be relevant but when I used to play online games, a pker stood for a player killer which meant they killed other persons characters.

Playerkillers?

PK in Asia means to "trip up" or "fall over"

Pkers are trippers, backstabbers, or "people killers" in games

a quick google search about PKRS shows that it is also a term for a virus on a Pokemon game?

AnswerYes, pkrs is a shortened Pokemon term for 'PokeRus' - a Pokemon virus. PokeRus is a status move which can be gained by a Pokemon from Ruby and Sapphire versions onward. In no way is it detremental to the Pokemon, in fact, it is completely beneficial. PokeRus raises the point average of the stat increases of a Pokemon levelling up. For example, a Rhyhorn who has PokeRus, gains 3 Speed points instead of 1 (upon levelling up).

PokeRus can be cured but not like other status-afflicting conditions. By leaving the infected Pokemon in the trainer's party, PokeRus eventualy dissapears over a period of 24 hours. The Pokemon them becomes immune to the virus.

Once a Pokemon is infected, it may spread it to other Pokemon - but only in the party, and only to Pokemon that aren't immune.