Dialga & Palkia LEGEND does NOT have Giratina. It is only those two, and no LEGENd cards have more than two Pokémon represented.
There are currently four unreleased legends, Dialga/Palkia, Darkrai/Cresselia, Deoxys/Rayquaza, and Groudon/Kyogre.
There isn't a Glaceon anywhere that could go in this set, leaving us with just the Leafeon from the Expert Deck Kit.
There are 79 cards left in the main Reviving Legends including the secret Alph Lithograph. With the LEGEND from Clash at the summit that is 80 cards with the secret. The leftover Pikachu/Raichu/Eevee/Leafeon make 84. However, those six cards are not the only ones left in the L-P Promotional cards. We know that the Espeon/Umbreon/Raichu/Slowpoke/Slowbro/Slowking will make the minimal 90 cards with the secret 91, but there are still eigth other promotional cards that never saw English release: Chikorita/Cyndaquil/Totodile/Phanpy/Mareep/Teddiursa/Lapras/ and Shuckle. And let's not forget about those other five shiny campaign cards: Ho-Oh/Lugia/Entei/Raikou/Suicune. I know that would add up to 103 cards, but all we know is at least 90 (most likely no more than 100) There are options that might push it above the minimal 90