Questions on these vintage Jumbo cards

[BrocksNoseBleed]

Can anyone shed any light on where these came from and their reason for being made.

Thanks guys!
Hope everyone has a great day

[D3F14NC3]

This link should answer your question

Bulbapedia Jumbo Cards (TCG)

They were promotional items given out at events, in magazines, etc.

[BrocksNoseBleed]

Thanks!