Yes pokesav works on r4i
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of course, new r4i v1.6 kernel can work on all below version of r4i card, including r4i v1.4 kernel.
The R4i will work in all DSis with the 1.0-1.3 firmware. It will NOT work it your DSi has been updated to the 1.4 firmware.
the r4i gold card can work on DSi V1.4e directly, no need any upgrade. Just install the latest wood r4i gold kernel to the SD card, then it can work.
The r4i gold card is much better than r4i ultra card. The r4i gold is most popular in the world. it can work on Ninendo 3DS, DSi V1.4.4 and DS console. the r4i gold firmware keep on update to support latest 3DS system update. But the r4i ultra card is a very old console. it is now out of production. And as lack of firmware update, it can only work on Nintendo DSi V1.4.1 and DS lite console.
This is the official website to download Pokesav for Pokemon Diamond, Pearl, and Platinum: http://projectpokemon.org/editing/pokesav/pokesavdownload.php If it doesn't work as a link, than copy it, and paste it in the address bar.