Poké Lids Trademark
Nintendo Co., Ltd., Creatures Inc., and Game Freak Inc. have applied for a ポケふた (Poké Lids) trademark in Japan for purposes including ‘metal lid for manhole’, ‘video game program’, and many more. Poké Lids are artistic covers for utility holes that are located around Japan. The story-line is that Diglett may be responsible for digging these and some artists have marked them. Actual application added below. Thanks to J-PlatPat.