(Handy list for reference!) -
https://bulbapedia.bulbagarden.net/wiki/Pokémon_games
The
Pokemon core series game boxarts are just beautiful; I love the simple formula of "logo + version mascot Pokemon + pretty abstract background"; even the Generation 1 games did great with their simplified designs. Not a single core series boxart has been "bad", in my opinion (although there is the lack of an English
Pokemon Green Version and the quirk of Suicune being strangely pitted against the ranks of Lugia and Ho-Oh).. Even most of the spin-off games have beautifully rendered artwork.
Going onward, I hope that the
Pokemon core series boxarts just use legendary Pokemon for the "version mascot" role (as started by Generation 2's main pair of
Pokemon Gold and Silver and subsequently codified by all of Generation 3's non-remake games,
Pokemon Ruby, Sapphire, and Emerald). While starter Pokemon were fitting for Generation 1, it would just look weird now, especially as the "version mascot" legendary Pokemon these days are intertwined in terms of lore, comparison, and contrasting. Also, the use of "unique" artwork rather than the stock promotional artwork (like what
Pokemon Emerald did for Rayquaza)
As for fonts, the majority of them have been great (although somewhat hard to identify at times {XD}).. I
adore the usage of the "Futura Bold" font for the subtitles of
Pokemon Ruby, Sapphire, Emerald, Diamond, Pearl, and Platinum Versions; it just seems so fulfilling!
Pokemon HeartGold/SoulSilver Versions also win points with their incorporation of the "Eurostile" font, and the
Pokemon Black 1/Black 2/White 1/White 2 font is amazingly futuristic.