Here are my results about Spring/Earth hybrid ( Opponent Basket Hound ):
(Use against Spring/Earth) Strong: Autumn; Birthstone; Bomb; Christmas;Icecream; Legendary (Crystal); Magic
(Avoid using against Spring/Earth) Weak: Electric; Fairy; Fire; Halloween; Rainbow; Realm Rune; Space (Planet); Spooky; Winter
Neutrals with Spring/Earth: Dark; Earth; Egypt; Lucky (Shamrock); Music; Nature; Royal; Service; Spring; Traveler; Treasure; Tree; Valentine; Water; Zodiac
Currently untested with: Food; Skull
(All tests are done on IOS device, based only on Strong/ weak / neutral hits. Critical hits have not been taken into account. )