Source: Pokédex design 宝可梦图鉴设计 (by IWSE Zhang - ArtStation)
宝可梦图鉴的设计，在细节上有借鉴过其他艺术家的设计以及官方设计图，很遗憾的是没有对屏幕内UI做设计处理（偷懒）
The design of the Pokémon Pokédex draws on the designs of other artists and official design drawings in terms of details. Unfortunately, there is no design processing for the on-screen UI (lazy)
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I agree, this one is a bit out of period, but I still get some 80s vibes like those handheld videogames:
Source of the image: A Guide to Nintendo’s Game & Watch '80s Retro Handheld Games - LevelSkip