If Jinzo is summoned it can be targetted by trap cards to stop it, once it has been succesfully summoned it's effect takes place and stops trap cards being activated. E.g you summon Jinzo, your opponent can immediately activate horn of heaven to destroy it. If Jinzo is already on the field then no trap cards can be activated.
*Once he is summoned, he is impossible to stop with traps. If your trap says "negate the summon," then he was never summoned, and therefore didn't stop the trap. Otherwise it doesn't work. That is how you can tell in the future as well. -Dragonheart91*
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No. Here is what happens when a player summons Jinzo. The turn player offers tribute, and places Jinzo on the field. His continuous effect is not yet 'switched on', nor any other continuous effects applied to him yet. Here, in the 'summon negation window', can cards be used to negate his summon. So you could negate the summon with Solemn Judgment, Horn of Heaven, etc. He'd go to the graveyard if that happened. If neither player want to negate Jinzo's summon, the summon is now successful. His continuous effect now becomes active, negating all traps currently active, and prohibiting new ones from being activated. Now we're in the 'summon response window', which is where Trap Hole would normally be used. Since Jinzo is now preventing any trap activations, it means any Trap that responds to a successful summon cannot be used. That means Trap Hole, Bottomless Trap Hole, Torrential Tribute, etc, can't be activated. Neither can Divine Wrath nor Forced Back could be used, because these respond only to 'activated effects'. Jinzo doesn't 'activate' anything, and even if he did, his continuous effect would stop Traps responding to it anyway. Lastly of course, non-responsive Traps (Phoenix Wing Wind Blast, Raigeki Break) can't do anything either, their activations are prevented while Jinzo remains face-up on the field.
little big horn
Really, only traps that negate his summon will work. That is because if his summon is negated, he never hits the field, and his continuous effect never 'switches on'.So Solemn Judgment, Horn of Heaven and Forced Back can all negate his summon. Note that since his effect is continuous and does not activate, you cannot use Divine Wrath or Gladiator Beast War Chariot.Secondly, if a Skill Drain is already active before he is summoned, when he hits the field, his trap negation effect will not switch on. Skill Drain will negate his effect, and other traps can be activated as normal.Lastly, his effect only works while he's on the field, so can be affected while he's in the hand, with cards like Trap Dustshoot.
The Ultimate Horn in Leafgreen is not an item, it's a pokemon. Heracross. You can find him on island 6 in the paddock on left from the horn house.
You must defeat The Corn Boss by yourself and then you can blow the horn.