If you are on desktop, just CRTL F the name of the formations that you are looking for.
Formation accessable through Sister Lily's 6* Grimoire Board
Formation obtainable through Mars's 6* Grimoire Board
Formation obtainable through Charlotte's 4* Grimoire Board
Formation accessable through Jack's 4* Grimoire Board
Formation obtainable through Magna's 4* Grimoire Board
Formation obtainable through Julius's 5* Grimoire Board
Formation accessable through Solid's 6* Grimoire Board
Formation obtainable through completing Rill's Defend Quest on expert difficulty
Formation obtainable through Nozel's 4* Grimoire Board
White Wolf
Formation accessable through Yami's 5* Grimoire Board
Formation obtainable through Valentines Day Vanessa's 6* grimoire
Obtainable through Demon Dweller Asta's 6* grimoire board
Formation accessable through Gueldre's 4* Grimoire Board
Formation obtainable through Vangeance's 4* grimoire
Obtainable through Heath's 6* grimoire board
Formation accessable through Kiato's 6* Grimoire Board
Formation obtainable through Gordon's 6* grimoire
Obtainable through Fuegoleon's 4* grimoire board
Formation accessable through Salamander Arm Fuegoleon's 6* Grimoire Board
Formation obtainable through Tag William's 6* grimoire
Obtainable through Luck's 6* grimoire board
Formation accessable through Licht's (Patri) 5* Grimoire Board
Formation obtainable through Noelle's (Yukata) 6* grimoire
Obtainable through Grey's 6* grimoire board