WHAT DO SILVALLY AND ARCUES HAVE IN COMMON? DOG LIKE; DOG LIKE; CHANGES TYPE BASED ON HELD ITEM; CHANGES TYPE BASED ON HELD ITEM; SIGNITURE MOVE TYPE CHANGES BASED ON HELD ITEM; SIGNITURE MOVE TYPE CHANGES BASED ON HELD ITEM; LEGENDARY/CAN ONLY GET ONCE IN THE GAME; LEGENDARY/CAN ONLY GET ONCE IN THE GAME; NOT PART OF THE ORIGINAL 151; NOT PART OF THE ORIGINAL 151; SEEN IN ANIME; SEEN IN ANIME