Ah sim, nem tinha analisado o código, só o gif, rs. Pensei que você tava arrastando ele pra testar, awoejawei.

Enfim, a função internalMoveCreature é usada para mover criaturas (quase igual a função internalTeleport) sem usar o algoritmo de Path Finding.
Em C++:

int LuaScriptInterface::luaGamePlayerMovePokemon(lua_State* L)
{
	// Game.playerMovePokemon(pokemon, toPosition)
	Creature* pokemon = getCreature(L, 1);
        const Position& position = getPosition(L, 2);

	if (pokemon->getMonster()) {
                std::forward_list<Direction> dirList;
                if(pokemon->getPathTo(position, dirList, 0, 0, true, true))
                      pokemon->startAutoWalk(dirList);
	}

	return 1;
}        

Lua: (Esse código ta mais elaborado do que o C++)

local pokemonsMoveTo = {}

function Player:movePokemonByList(pokemon, dirList, index)
	if self and pokemon and #dirList >= index then
		local speed = pokemon:getSpeed() * 3
		pokemon:move(dirList[index], 16)
		index = index + 1

		pokemonsMoveTo[self:getId()] = addEvent(function()
			self:movePokemonByList(pokemon, dirList, index)
		end, speed)
	end
end

function Player:movePokemon(pos)
	local pokemon = self:getSummons()
	if #pokemon == 0 then
		return false
	end

	if pokemonsMoveTo[self:getId()] then
		stopEvent(pokemonsMoveTo[self:getId()])
		pokemonsMoveTo[self:getId()] = nil
	end

	local dirList = pokemon[1]:getPathTo(pos, 0, 0, true, true)
	self:movePokemonByList(pokemon[1], dirList, 1)
	return true
end