Week Siblings

The Week Siblings (Japanese: 曜日兄弟 Weekday Siblings), also known as the Once-a-week Siblings, are seven characters from the Generation II games and their remakes, Pokémon HeartGold and SoulSilver, who will appear at a certain location depending on the day of the week. They were one of the aspects of the game taking advantage of the built-in clock system.

At all times on Route 26, a note in the house of the Week Siblings can be found, saying when and where each will appear. By going to the location on the right day of the week and talking to the Week Sibling, they would give players a certain type-enhancing held item. Each Week Sibling only gives a player one item; if someone were to visit them again on any following week, they would have nothing.

Name	Japanese	Romaji	Day	Location	Item	Enhanced
Monica	ツキコ	Tsukiko	Monday	Route 40	Sharp Beak	Flying
Tuscany	ヒコ	Hiko	Tuesday	Route 29	Pink Bow*	Normal
					TwistedSpoon*	Psychic
Wesley	ミズオ	Mizuo	Wednesday	Lake of Rage	Black Belt	Fighting
Arthur	モクオ	Mokuo	Thursday	Route 36	Hard Stone	Rock
Frieda	カネコ	Kaneko	Friday	Route 32	Poison Barb	Poison
Santos	ツチオ	Tsuchio	Saturday	Blackthorn City	Spell Tag*	Ghost
					Soft Sand*	Ground
Sunny	ニチオ	Nichio	Sunday	Route 37	Magnet	Electric

Trivia

• Coincidentally, the days the Week Siblings do not appear on a route (Wednesday and Saturday) are the days when the Pokémon Crystal move tutor is in Goldenrod City.
• Of all of the Week Siblings, in Generation II, only Sunny gives an item that boosts an elemental type not formerly governed solely by the Attack stat, as well as the only such item with one word in its name.
• Tuscany and Santos are the only ones to change the items given out between generations.
• The Japanese names for the Week Siblings are related to the different readings of the kanji used for the days of the week. For example, the Japanese word for Monday is 'getsuyōbi'　(月曜日), or 'moon day'. The kanji for moon (月) can be pronounced as either 'getsu' or 'tsuki', hence Tsukiko (Monica of Monday), with the traditional feminine suffix '-ko', meaning child.
  • This applies to all except Arthur of Thursday and Sunny of Sunday, whose Japanese names use the same pronunciation as their respective days of the week.

Professor Elm • Professor Oak • Mom • Ethan • Lyra • Silver • Mr. Pokémon • Eusine • Lance • Red • Kiyo • Baoba • Magnus • Earl • Kurt • Carrie • Dude
Mary • Buena • Radio Director • Haircut brothers • Webster • Master • Li • Wilma • Primo • Maximo • Jet • Caitlin • Cynthia • Cameron • Mr. Game • Felicity • Teala
Team Rocket • Gym guide • Gym Leaders • Frontier Brains • Kimono Girls • Week Siblings • Name Rater • Poké Seer • Day-Care Couple • Professor's aides