Why did Royal Enfield discontinue Old Classic 350 Stealth Black and Will it be available at any of the showrooms across India?

The main thing to note is that Stealth Black was associated with the older Classic 500, not the regular old Classic 350. Royal Enfield later moved to the newer J-platform Classic 350 line-up with updated variants and colourways, so the older Stealth Black-era bike was phased out as the range changed