DRAC=DRAGON
Exeggcute being seeds was never a secret, it is right in their Pokédex entries.
“Often mistaken for eggs. When disturbed, they quickly gather and attack in swarms.” - Pokémon Red and Blue
“A Pokémon that is like the seeds of a plant. If you find one and chase it, others will join it without you noticing.” - Pokémon Stadium