Random Encounters, how do i do this?

[Fillipem]

So I want to make something like a Random Encounter Battle stuff, like the ones in Pokemon, There's some way i can do this?

[Decal]

use the expression random(number), if you use random(100) it will be a random number between 0 and 99.
Then use that number for different creatures spawns, attacks, damage etc

[UltimateWalrus]

Let's say you want a random encounter every 5-30 seconds while the player is walking around. You can do something like this pseudocode:

Start of application      --> Set RandomEncounterTimer to 5*60 + random(25*60)
Player is walking         --> Subtract 1 from RandomEncounterTimer
RandomEncounterTimer <= 0 --> Set RandomEncounterTimer to 5*60 + random(25*60)
                            + Jump to frame "Random encounter"