Decorations beautify your Magikarp’s pond and give permanent bonuses; single-use items offer a one-off boost. Here is the list of both, with their prices and effects.

The Nugget, one of the events that earn coins.

Decorations

A decoration placed in the pond permanently increases a gain: HP from food, HP from training, coins… They are bought with diamonds or earned by beating a league. Each new decoration also counts toward an achievement.

DecorationPrice or conditionEffect
Shaymin Seaweed250 diamondsHP (food) + 14%.
Clefairy Doll350 diamondsHP (skills) + 20%.
Octillery VaseBeat the Heavy LeagueHP (food) + 10%.
Cacnea Pot400 diamondsSkill recovery rate + 10%.
Potted Sunflora200 diamondsCoins (events) + 28%.
Whimsicott Cushion450 diamondsExperience points + 9%.
Lilligant Doll450 diamondsChance of events after training + 6%
Sudowoodo BonsaiBeat the Fast LeagueCoins (events) + 29%.
Exeggutor Palms450 diamondsCoins (League) + 12%.
Eevee Statue550 diamondsChance of events after a League + 4%.
Lampent Lamp250 diamondsCoins (level) + 29%.
S.S. Anne Model450 diamondsCoins (treasures) + 68%.
Aegislash Ornament350 diamondsHP (training) + 20%.
Starmie FountainBeat the Heal LeagueSkill recovery rate + 10%
Parasect Mushrooms100 diamondsHP (events) + 16%.
SignRetire a MagikarpMaximum amount of food +1.
Dugtrio Rock350 diamondsCoins (level) + 32%.
Clone Plush300 diamondsMaximum amount of food +2.
Ditto BeanbagTrigger event No. 46, 550 diamondsCoins + 10%.
Red CapBeat the Elite Four LeagueHP (training) + 20%.
Golden StatueBeat the Master LeagueCoins + 12%.

Single-use items

They are bought with diamonds in the shop and used once.

ItemPriceEffect
Sports Soda25 diamondsRestores 1 training point. (Pack of 3)
Power+200 diamondsIncreases HP gains by 50% for 3 hours.
League Spray25 diamondsRestores 1 League point.
Skill Herb150 diamondsRestores the skills of the support Pokémon.
Small Coin Bag100 diamondsGives a few coins. (Varies with Trainer Rank.)
Coin Bag300 diamondsGives coins. (Varies with Trainer Rank.)
Big Coin Bag800 diamondsGives a lot of coins. (Varies with Trainer Rank.)

Our articles from the time: Decorations and ponds and Single-use items.