[Scripting Question] Form-specific wild encounters

[Tigerfang98]

How do you make form-specific wild Pokemon encounters? For example, only a certain form of shells or unown

 

[Vendily]

Oh, I had to do this in my own game!

"getFormOnCreation"=>proc{|pokemon|
   maps=[5]   # Map IDs for form
   if $game_map && maps.include?($game_map.map_id)
     next 1
   else
     next 0
   end
},

Just add the ids of the maps that you want the second form to appear on.
If you have multiple forms, you could either make multiple arrays, randomly select, or do a case block.
I'm in the mood to code, so have some examples.
Multiple arrays:

Spoiler:

"getFormOnCreation"=>proc{|pokemon|
   maps1=[5]   # Map IDs for form 1
   maps2=[6]   # Map IDs for form 2
   if $game_map && maps1.include?($game_map.map_id)
     next 1
   elsif $game_map && maps2.include?($game_map.map_id)
     next 2
   else
     next 0
   end
},

Randomly selected on certain maps (random number)

Spoiler:

"getFormOnCreation"=>proc{|pokemon|
   maps=[5]   # Map IDs for form
   if $game_map && maps.include?($game_map.map_id)
     f = rand(3)
     next (f +1) # Randomly picks forms 1, 2, or 3
   else
     next 0
   end
},

Randomly selected on certain maps (Personal ID)

Spoiler:

"getFormOnCreation"=>proc{|pokemon|
   maps=[5]   # Map IDs for forms
   if $game_map && maps.include?($game_map.map_id)
     lowbyte=@personalID&0xFF00 #gets the second last pair of bytes of the PID (0xBE of 0xDEADBEEF)
    case (lowbyte + (lowbyte % 5)) % 3 # Copied from older code, might have to play with numbers to get a good random result
    when 2
      next 3 # form 3
    when 1
      next 2 # form 2
    else
      next 1 # form 1
    end
   else
     next 0
   end
},

Case block of map ids:

Spoiler:

"getFormOnCreation"=>proc{|pokemon|
   case $game_map.map_id
   when 1
     next 1
   when 4
     next 2
   when 7
     next 3
   else
     next 0
   end
},

I didn't really test my examples, but the first one I pasted does work for a fact!

EDIT: By the way, this is the code for Shellos:

MultipleForms.register(:SHELLOS,{
"getFormOnCreation"=>proc{|pokemon|
   maps=[2,5,39,41,44,69]   # Map IDs for second form
   if $game_map && maps.include?($game_map.map_id)
     next 1
   else
     next 0
   end
}
})

And this is the code for Unown:

MultipleForms.register(:UNOWN,{
"getFormOnCreation"=>proc{|pokemon|
   next rand(28)
}
})