Why don't you set the Pokemon's invisibility to 1 and the density to 0. Then when the player/client gets x amount of steps away or towards (either one), make the Pokemon pop out.

Not very efficient but it's what comes off the top of my head. You should probably make that a mob/proc and apply it to all the Pokemon.


EXAMPLE:

w8 can u put the full 1 up plz cause i dont kno how to finish it. i admint am a newbie in this coding thing

hmmmm k am reading it...but let me explain word to word wat am trying to do. Basicly like this. When u step in certain area. theres should be like a 10 properbilty that a pokemon apppears.thenit wanders away.you kno walk on grass.like pokemon games u walk on grassthenit says wild {pokemon} appears....10 seconds later {pokemon} has wader away