ref: 1222ea7def97c6d78abef09f25787ef555e5c1cd
dir: /engine/battle/move_effects/sunny_day.asm/
BattleCommand_StartSun: ld a, WEATHER_SUN ld [wBattleWeather], a ld a, 5 ld [wWeatherCount], a call AnimateCurrentMove ld hl, SunGotBrightText jp StdBattleTextbox