Aquapolis is a set in the E-Card series. It was released on January 15, 2003. The printed size is 147. This checklist is longer, at 182 cards. Blissey is H6/147, in position 156 of 182 on this checklist. Before it is H5 Bellossom, and after it is H7 Electrode. The listed rarity is Rare Holo.
Blissey is a Stage 1 Colorless Pokémon with 120 HP. In the Pokédex this is Blissey (#242), generation 2 (Johto). The card says it evolves from Chansey. In this catalog that name is Chansey (#113).
Naoyo Kimura illustrated this card. The same name is on 256 other cards in the catalog.
Blissey (#242) has 21 other cards in the catalog. Those other cards are in 17 sets. The other printings with a release date run from 2001 to 2024. The earliest other card is Blissey 2/64 in Neo Revelation (2001). Both list 120 HP. Both list the rarity Rare Holo. Yuka Morii illustrated that card, and Naoyo Kimura illustrated this one. 17 other cards of Blissey list a different HP.
Happy Healing is listed as Poké-Power. Once during your turn (before your attack), choose 1 of your Benched Pokémon and flip a coin. If heads, count the number of Energy attached to Blissey and then remove that many damage counters from the chosen Benched Pokémon. This power can't be used if Blissey is affected by a Special Condition. The attack Smash Bomber lists 50 damage. The cost is Colorless, Colorless, Colorless. Flip a coin. If tails, this attack does nothing. Weakness is Fighting ×2. Retreat cost is 2.
I keep a set binder for Aquapolis, meant to hold every card of that set. This card is one slot in the Aquapolis set binder. A generation binder holds one card of each species. Blissey can fill a slot in Generation 2 binder (Johto). I still need this card.