** Generation Development GDG.AX soars as much as 9.2% to A$4.740; marks biggest intraday pct gain since April 10
** Fund administrator's unit enters into strategic alliance with global asset manager BlackRock BLK.N to develop Holistic Retirement Solutions for retirees
** BlackRock will buy A$25 mln ($16 mln) stake in co
** GDG last up 3.7%, takes YTD gains to 26.7%
($1 = A$1.5516)
(Reporting by Nichiket Sunil in Bengaluru)
((Nichiket.Sunil@thomsonreuters.com;))