After spending several days searching double battle mod, Enduring the pain of not playing Version 14 since the first day it was released. without success, I had to take matters into my own hands and do some research from : 2v2 Mod: Rejuvenation 13.5 port by mog
[19.16][Mod] 2v2 / Double battles everywhere (trainers/wild encounters) By vilrose
file script from v14.
[E19] Oops, ALL Doubles! [Full Battle Conversion / Challenge Mod] by Mister_ecks cant use, it buggy,
Install
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Copy:
patch/Mods/DoubleBattlesEverywhereV14.rb
into the root of your Pokemon Rejuvenation V14 installation.
What it changes
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1. Trainer battles are forced into double-battle mode.
2. Normal random encounters generate one wild Pokemon.
3. Existing scripted pbWildBattle(...) calls are NOT changed, which reduces
the chance of breaking story/boss encounters.
4. It does not replace Rejuvenation's entire Scripts folder.
Important
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Back up your game folder/save before installing any script mod.
Double_Battles_Everywhere_Rejuvenation_V14.rar