I let Deepseek translate 永谷園、「ポケモンお茶づけ」発売、人気キャラクター第４弾 - 日本食糧新聞・電子版 into English:
Note: Deepseek translated Omosubi to Onigiri which means the same to my understanding
Nagatanien Co., Ltd. (Headquarters: Minato-ku, Tokyo; Tel: 03-3432-2511) launched “Pokémon Ochazuke” and “Pokémon Onigiri” on February 23, featuring characters from Pokémon. These mark the fourth installment in the company’s successful Pokémon product line, following last year’s hits—curry, furikake (rice seasoning), and pancakes.
“Pokémon Ochazuke” includes two flavors per pack: seaweed and salmon. To appeal to younger consumers, the product contains kamaboko (fish cake) shaped like Pikachu, one of Pokémon’s most popular characters.
With children’s health in mind, each small packet (3g) is fortified with 12mg of calcium and designed to be low in sodium.
“Pokémon Onigiri” comes in three varieties: salmon, green vegetables, and bonito flakes—all kid-friendly choices. These also incorporate calcium, with each small packet containing 58mg (salmon), 67mg (green vegetables), or 58mg (bonito flakes).
The products also come with premium collectibles, a key selling point for character-themed goods. **The ochazuke includes 32 types of Pokémon variety stickers, while the onigiri features **30 types of Pokémon BIG stickers.
Sales targets for the first year are set at ¥1.2 billion for ochazuke and ¥1.5 billion for onigiri. The products will roll out nationwide, starting in the Shinetsu region.
Product Details: * Pokémon Ochazuke: 15g per pack; packaging: 5 bags × 10 packs × 12 boxes; standard retail price: ¥130. * Pokémon Onigiri: 14.4g (salmon), 16.4g (green vegetables), 14.4g (bonito flakes); packaging: 4 bags × 10 packs × 6 boxes; standard retail price: ¥130 (uniform across all three varieties).
This would mean, that the 1998 ochazuke featured 32 Variety stickers. Therefore it would follow that every number above No. 32 would be a later release. Maybe the 1999 one. I think this is a strong working assumption. The one thing that speaks against this is the fact that the 1999 ad also shows the sticker sheet from the 1998 ad, as I wrote here. So for better or worse I propose:
02-23-1998: Nagatanien Ochazuke Variety Stickers No. 01–32
02-23-1998: Nagatanien Omosubi Big Stickers 01–30
??-??-1999: Nagatanien Ochazuke Variety Stickers No. 32–??
??-??-1999: Nagatanien Bento Curry Folded Sheets
??-??-2000: Nagatanien [DETAILS?] “Big Stickers v2” (as seen in ad)
Best,
orannge