ref: a18f83b911afa94f4f3522204cd404c3e92df58e
dir: /engine/battle/move_effects/sunny_day.asm/
BattleCommand_StartSun: ; startsun ld a, WEATHER_SUN ld [wBattleWeather], a ld a, 5 ld [wWeatherCount], a call AnimateCurrentMove ld hl, SunGotBrightText jp StdBattleTextbox