[Scripting Question] v18 3rd type?

[NeroCraft]

hello, for v18 is there a guide for adding the third type (fourth, fifth)? i tried to do it myself but i can't find in v18 strings like that

optionaltypes={
..
"Type2"=>[9,"e",PBTypes],
"Type3"=>[10,"e",PBTypes],

and got errors like that

Message: uninitialized constant PokeBattle_Pokemon::SpeciesType3

Backtrace:
PokeBattle_Pokemon:398:in `type3'
PScreen_Summary:455:in `drawPageOne'
PScreen_Summary:353:in `drawPage'
PScreen_Summary:165:in `pbStartScene'
PScreen_Summary:1340:in `pbStartScreen'
PScreen_Party:639:in `pbSummary'
PScreen_Party:1217:in `pbPokemonScreen'
PScreen_Party:1114:in `loop'
PScreen_Party:1323:in `pbPokemonScreen'
PScreen_PauseMenu:178:in `pbStartPokemonMenu'