Pkrs is the in-game abbreviation of PokeRus (taken from Pokemon and virus). The word simply means that it is a virus that affects only Pokemon in the game. Pokemon with PokeRus, as said above, develop their stats better than normal Pokemon, so the virus is completely beneficial. Be aware, though, that PokeRus will fade away if you keep your infected Pokemon in your party over 24 hours. To keep the PokeRus condition, repeditively store your Pokemon in the PC overnight. You will know if your Pokemon has become immune to PokeRus as it has a dot (.) where the face used to be (signifying it had the condition, as well as the 'pkrs' word under 'status').
PokeRus is contracted through in-game play; battling wild Pokemon. Just like the shiny condition, Pokemon may have the PokeRus condition (but both are extremely rare). If you battle a wild Pokemon which has PokeRus, your fighting Pokemon will contract it and you will then have a method of transferring the virus to your other Pokemon. To transfer the virus to other Pokemon, simply have the desired Pokemon in your party and battle with the infected Pokemon. Very soon it will catch on. Note: Immune Pokemon (who have had and passed the virus) cannot get re-infected.
Of course, you can always migrate or trade for a Pokemon that has PokeRus. It is not very particular, so you really can trade for any Pokemon. This is probably the best option as the virus is very rare and the chances of contracting it are very low. Having said that, persistance is the key to most things in Pokemon games, so you never can tell.
Read more: What_does_PKRS_mean_in_Pokemon_Diamond_and_Pearl_and_how_do_you_get_it
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PKRS makes a Pokemon sick and lets it battle better and get more exp points then normalo so it is great for leveling up. You get it by battling a Pokemon that has it then go to nurse joy in the Pokemon center.
It is a good virus that hightens stats in Pokemon
You must first catch a Pokemon with pkrs which is extremely rare. If you want more Pokemon to catch it in the PC put the Pokemon with pkrs next to other Pokemon and they will catch it. Unfortunately it is complete luck if you catch a Pokemon with pkrs and there is no way of making one catch it exept for what i have put above. Hope i helped!
yes lugia can but it will take a while
click on the pokemons summary in the PC and in purple it should say pkrs.