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 6/147, in position 6 of 182 on this checklist. Before it is 5 Bellossom, and after it is 7 Donphan. The listed rarity is Rare.
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. The rarity there is Rare Holo, and here it is Rare. 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.