it says in the screenshot that it's for Game Boy Advance lol... if you're still this confused go watch a gameplay video on youtube or something
the first two games were on the GBA, and the last two games were on the DS
there have been no advance wars games in 12 years, that's why its a literal who to many people (days of ruin was released in 2008, and i don't think it was as popular as its predecessors)
the main strategy game line that nintendo/intelligent systems gives a stuff about now is mainly fire emblem