One also should be careful about trying to predict the rotation. To give you an idea:
- Four sets rotated for the Rocket-On (2001 to 2002) Format - Base Set, Jungle, Fossil, Base Set 2
- Three sets rotated for the Neo-on or Neon (2002 to 2003) Format - Team Rocket, Gym Heroes, Gym Challenge
- Five sets rotated for the E-card On or Eon (2003 to 2004) Format - Neo Genesis, Neo Discovery, Neo Revelation, Neo Destiny, Legendary Collection
- Three sets rotated for the RS-On (2004 to 2005) Format - Expedition, Aquapolis, Skyridge
- Four sets rotated for the HL-On (2005 to 2006) Format - EX: Ruby & Sapphire, EX: Sandstorm, EX: Dragons, EX: Team Magma vs Team Aqua
- Three sets rotated for the DX-On (2006 to 2007) Format - EX: Hidden Legends, EX: FireRed & LeafGreen, EX: Team Rocket Returns
- Five sets were rotated for the HP-On (2007 to 2008) Format - EX: Deoxys, EX: Emerald, EX: Unseen Forces, EX: Delta Species, EX: Legend Maker
- Four sets were rotated for the first DP-On (2008 to 2009) Format - EX: Holon Phantoms, EX: Crystal Guardians, EX: Dragon Frontiers, EX: Power Keepers
- Zero sets were rotated for the second DP-On (2009-2010) Format - This is the only time this has happened since set rotation began.
- Four sets were rotated for the MD-On (2010-2011) Format - Diamond & Pearl, DP: Mysterious Treasures, DP: Secret Wonders, DP: Great Encounters
- Seven sets were rotated for the HS-On (2011-2012) Format - DP: Majestic Dawn, DP: Legends Awakened, DP: Stormfront, Platinum, PL: Rising Rivals, PL: Supreme Victors, PL: Arceus
- Five sets were rotated for the BW-On (2012-2013) Format - HearGold/SoulSilver, HS: Unleashed, HS: Undaunted, HS: Triumphant, Call of Legends
- Three sets were rotated for the NXD-On (2013-2014) Format - Black & White, BW: Emerging Powers, BW: Noble Victories
- Three sets were rotated for the BCR-On (2014-2015) Format - BW: Next Destinies, BW: Dark Explorers, BW: Dragons Exalted
- Five sets were rotated out for the XY-On (2015-2016) Format - BW: Boundaries Crossed, BW: Plasma Storm, BW: Plasma Freeze, BW: Plasma Blast, Legendary Treasures
Obviously I did not list promo cards or miniature sets.
While other circumstances matter, this does suggest things can vary quite a bit. As few as no sets is possible, as many as seven is not unprecedented. The average is a little under four, with four being the middle value as well, and most common is three sets.
Max Elixir may become more commons - one time use and for better or worse an Item. Evolutions that are not Restored Pokémon or entering play via
Archie's Ace in the Hole/
Maxie's Hidden Ball Trick would just have to use it on their Basic Stage.