[Moves] Roar and Whirlwind rarely switches to the last Pokemons

Hello~

When using Roar or Whirlwind on a trainer with 3 Pokemons, the odds of forcing a switch to the opponent's last Pokemons are significantly lower than the odds of switching to the first two Pokemons.

Prerequisites (for testing):

-Two players.

-Player A has a level 100 Pokemon with Whirlwind.

-Player B has 5 low levels Pokemon and one high level Pokemon (for easy distinction, levels do not influence the issue)

Steps to reproduce:

1. Player B sets his high level Pokemon to the last slot of his or her party.

2. Both players start a fight together.

3. Player A KOs any three of Player B's low level Pokemons.

4. Player A repeatedly uses Whirlwind.

Current Result:

The odds of the high level Pokemon to be switched to are close to 1/6 or 1/5.

Expected Result:

The odds of the high level Pokemon to be switched to should be close to 1/2, as there are only two possible outcomes.

Notes:

- This issue occurs both against players and trainers.

- With 4 or more Pokemons, it has been noticed that the odds remain high for the leading two remaining pokemons. It is thought that a number between 1 and 6 is randomly generated, and if it falls on an empty slot, it simply selects the first available Pokemon instead of rerolling.

-Although it hasn't been tested, it is assumed that this issue also applies to Dragon Tail and Circle Throw.

-The testing was done with the following results, where O = low level pokemon, X = fainted pokemon, C = High level pokemon (Crobat). Odds are the amount of times Whirlwind/Roar caused to switch from a low level Pokemon to the high level pokemon.

** 4/20 XXXOOC

** 3/20 OXXXOC

** 3/20 XOXOXC

** 4/20 OOXXXC

** 4/20 XOOXXC

** 7/40 OOCXXX

** 8/40 OOC