If you want the Akari Pikachu CHR specifically, buying the single at ~$40 raw is far cheaper than chasing through boxes (~1 in 6.5 packs gets a CHR, but split across 6 different CHRs gives you ~1 in 40 packs for Akari Pikachu specifically roughly 2 boxes per copy on average)
Value isn't static, so you need to focus on recent sales data
6 Gladion Full Art $12.79 Your Rival From Alola Gladion has the same effect as Heavy Ball, but the main difference is that it is a Supporter
Once Nightwhorl Hermit has been blocked, putting enough cards in your graveyard to reach a total of seven or more cards won't cause it to become unblocked
This cements why removal like Path to Exile, Abrade, and even the due-for a kindred reprint, Rootgrapple are so important over an otherwise flexible card in Bramblecrush
And for an extensive fact file on Pokmon populations, try our 'how many Pokmon are there' guide